TY  - JOUR
AU  - Lorenc, Ljubinka
AU  - Bondarenko-Gheorghiu, Lidija
AU  - Pavlović, Vladimir B.
AU  - Führer, Hermann
AU  - Kalvoda, Jaroslav
AU  - Mihailović, Milhailo Lj.
PY  - 1992
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4743
AB  - Catalytic hydrogenation of the Δ3‐unsaturated (9R,10 R)‐ and (9S,10 S)‐epoxyenol lactones 3a, b., and 4a, b., respectively, affords, in addition to the expected saturated epoxylactones 5a, b and 7a, b, also open‐chain products, i.e. the diastereoisomeric (9R,10R)‐ and (9S,10S)‐9,10‐expoxy‐8‐oxo‐4,5‐secosteroklastan‐5‐oic acids 6a, b. and 8a, b. Alkaline hydrolysis of the lactone ring of compounds 5 and 7 and subsequent acetylation of the corresponding hydroxy derivatives give as the major products the open‐chain, diasteroisomeric (9R,10R)‐ and (9S,10S)‐4‐acetoxy‐9,10‐epoxy‐methyl esters 9a, b and 11a, b, respectively, and, but only in the androstane series, the tetrahydropyran derivatives 10a and 12a, as the minor components.
PB  - Weinheim : Wiley-VCH Verlag GmbH & Co.
T2  - Helvetica Chimica Acta
T1  - Opening of the Macrocyclic Ring in 5,10:8,9‐Disecosteroids ( = Steroklastanes)
VL  - 75
IS  - 1
SP  - 203
EP  - 209
DO  - 10.1002/hlca.19920750118
ER  - 

@article{
author = "Lorenc, Ljubinka and Bondarenko-Gheorghiu, Lidija and Pavlović, Vladimir B. and Führer, Hermann and Kalvoda, Jaroslav and Mihailović, Milhailo Lj.",
year = "1992",
abstract = "Catalytic hydrogenation of the Δ3‐unsaturated (9R,10 R)‐ and (9S,10 S)‐epoxyenol lactones 3a, b., and 4a, b., respectively, affords, in addition to the expected saturated epoxylactones 5a, b and 7a, b, also open‐chain products, i.e. the diastereoisomeric (9R,10R)‐ and (9S,10S)‐9,10‐expoxy‐8‐oxo‐4,5‐secosteroklastan‐5‐oic acids 6a, b. and 8a, b. Alkaline hydrolysis of the lactone ring of compounds 5 and 7 and subsequent acetylation of the corresponding hydroxy derivatives give as the major products the open‐chain, diasteroisomeric (9R,10R)‐ and (9S,10S)‐4‐acetoxy‐9,10‐epoxy‐methyl esters 9a, b and 11a, b, respectively, and, but only in the androstane series, the tetrahydropyran derivatives 10a and 12a, as the minor components.",
publisher = "Weinheim : Wiley-VCH Verlag GmbH & Co.",
journal = "Helvetica Chimica Acta",
title = "Opening of the Macrocyclic Ring in 5,10:8,9‐Disecosteroids ( = Steroklastanes)",
volume = "75",
number = "1",
pages = "203-209",
doi = "10.1002/hlca.19920750118"
}

Lorenc, L., Bondarenko-Gheorghiu, L., Pavlović, V. B., Führer, H., Kalvoda, J.,& Mihailović, M. Lj.. (1992). Opening of the Macrocyclic Ring in 5,10:8,9‐Disecosteroids ( = Steroklastanes). in Helvetica Chimica Acta
Weinheim : Wiley-VCH Verlag GmbH & Co.., 75(1), 203-209.
https://doi.org/10.1002/hlca.19920750118

Lorenc L, Bondarenko-Gheorghiu L, Pavlović VB, Führer H, Kalvoda J, Mihailović ML. Opening of the Macrocyclic Ring in 5,10:8,9‐Disecosteroids ( = Steroklastanes). in Helvetica Chimica Acta. 1992;75(1):203-209.
doi:10.1002/hlca.19920750118 .

Lorenc, Ljubinka, Bondarenko-Gheorghiu, Lidija, Pavlović, Vladimir B., Führer, Hermann, Kalvoda, Jaroslav, Mihailović, Milhailo Lj., "Opening of the Macrocyclic Ring in 5,10:8,9‐Disecosteroids ( = Steroklastanes)" in Helvetica Chimica Acta, 75, no. 1 (1992):203-209,
https://doi.org/10.1002/hlca.19920750118 . .

TY  - JOUR
AU  - Lorenc, Ljubinka B.
AU  - Pavlović, Vladimir D.
AU  - Mihailovíć, Mihailo  Lj.
AU  - Kalvoda, Jaroslav
AU  - Führer, Hermann
PY  - 1991
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4393
AB  - UV irradiation of the unsaturated (E)‐5,10‐secosteroidal ketones 1 and 6 results, in addition to (E/Z)‐isomerization, in an intramolecular Pateino‐Büchi reaction and, in the case of 1, in transannular cyclization (along with AcOH elimination). The stereochemistry of the observed intramolecular photoprocesses can be explained in terms of ground‐state conformations of the (E)‐seco‐ketones 1 and 6 in solution.
PB  - Wiley - VCH Verlag GmbH & Co
T2  - Helvetica Chimica Acta
T1  - Synthesis, structure, and reactivity of secosteroids containing a medium‐sized ring. Part 32. Conformations and photochemical reactivity of some unsaturated 5,10‐secosteroidal ketones
VL  - 74
IS  - 7
SP  - 1459
EP  - 1463
DO  - 10.1002/hlca.19910740709
ER  - 

@article{
author = "Lorenc, Ljubinka B. and Pavlović, Vladimir D. and Mihailovíć, Mihailo  Lj. and Kalvoda, Jaroslav and Führer, Hermann",
year = "1991",
abstract = "UV irradiation of the unsaturated (E)‐5,10‐secosteroidal ketones 1 and 6 results, in addition to (E/Z)‐isomerization, in an intramolecular Pateino‐Büchi reaction and, in the case of 1, in transannular cyclization (along with AcOH elimination). The stereochemistry of the observed intramolecular photoprocesses can be explained in terms of ground‐state conformations of the (E)‐seco‐ketones 1 and 6 in solution.",
publisher = "Wiley - VCH Verlag GmbH & Co",
journal = "Helvetica Chimica Acta",
title = "Synthesis, structure, and reactivity of secosteroids containing a medium‐sized ring. Part 32. Conformations and photochemical reactivity of some unsaturated 5,10‐secosteroidal ketones",
volume = "74",
number = "7",
pages = "1459-1463",
doi = "10.1002/hlca.19910740709"
}

Lorenc, L. B., Pavlović, V. D., Mihailovíć, Mihailo  Lj., Kalvoda, J.,& Führer, H.. (1991). Synthesis, structure, and reactivity of secosteroids containing a medium‐sized ring. Part 32. Conformations and photochemical reactivity of some unsaturated 5,10‐secosteroidal ketones. in Helvetica Chimica Acta
Wiley - VCH Verlag GmbH & Co., 74(7), 1459-1463.
https://doi.org/10.1002/hlca.19910740709

Lorenc LB, Pavlović VD, Mihailovíć, Mihailo  Lj., Kalvoda J, Führer H. Synthesis, structure, and reactivity of secosteroids containing a medium‐sized ring. Part 32. Conformations and photochemical reactivity of some unsaturated 5,10‐secosteroidal ketones. in Helvetica Chimica Acta. 1991;74(7):1459-1463.
doi:10.1002/hlca.19910740709 .

Lorenc, Ljubinka B., Pavlović, Vladimir D., Mihailovíć, Mihailo  Lj., Kalvoda, Jaroslav, Führer, Hermann, "Synthesis, structure, and reactivity of secosteroids containing a medium‐sized ring. Part 32. Conformations and photochemical reactivity of some unsaturated 5,10‐secosteroidal ketones" in Helvetica Chimica Acta, 74, no. 7 (1991):1459-1463,
https://doi.org/10.1002/hlca.19910740709 . .

TY  - JOUR
AU  - Mihailović, Milhailo Lj.
AU  - Lorenc, Ljubinka B.
AU  - Pavlović, Vladimir D.
AU  - Führer, Hermann
PY  - 1981
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4424
AB  - It was found that analysis of the 1H‐NMR. signals (at 360 (preferably) and/or 100 MHz) of the protons at C (4) and of the equatorial α‐proton at C (6), particularly when these are located in the 2–3 ppm region and therefore convenient for detection and identification, may be of valuable aid in the structural and configurational characterization of 5‐hydroxy‐ and 5‐acetoxy‐steroids (unsubstituted or containing a hydroxy or acyloxy substituent at C (3)).
PB  - Wiley-Blackwell
T2  - Helvetica Chimica Acta
T1  - Some Observations Concerning 1H‐NMR. Spectra of 5‐hydroxy‐ and 5‐acetoxy‐steroid compounds
VL  - 64
IS  - 4
SP  - 1032
EP  - 1039
DO  - 10.1002/hlca.19810640409
ER  - 

@article{
author = "Mihailović, Milhailo Lj. and Lorenc, Ljubinka B. and Pavlović, Vladimir D. and Führer, Hermann",
year = "1981",
abstract = "It was found that analysis of the 1H‐NMR. signals (at 360 (preferably) and/or 100 MHz) of the protons at C (4) and of the equatorial α‐proton at C (6), particularly when these are located in the 2–3 ppm region and therefore convenient for detection and identification, may be of valuable aid in the structural and configurational characterization of 5‐hydroxy‐ and 5‐acetoxy‐steroids (unsubstituted or containing a hydroxy or acyloxy substituent at C (3)).",
publisher = "Wiley-Blackwell",
journal = "Helvetica Chimica Acta",
title = "Some Observations Concerning 1H‐NMR. Spectra of 5‐hydroxy‐ and 5‐acetoxy‐steroid compounds",
volume = "64",
number = "4",
pages = "1032-1039",
doi = "10.1002/hlca.19810640409"
}

Mihailović, M. Lj., Lorenc, L. B., Pavlović, V. D.,& Führer, H.. (1981). Some Observations Concerning 1H‐NMR. Spectra of 5‐hydroxy‐ and 5‐acetoxy‐steroid compounds. in Helvetica Chimica Acta
Wiley-Blackwell., 64(4), 1032-1039.
https://doi.org/10.1002/hlca.19810640409

Mihailović ML, Lorenc LB, Pavlović VD, Führer H. Some Observations Concerning 1H‐NMR. Spectra of 5‐hydroxy‐ and 5‐acetoxy‐steroid compounds. in Helvetica Chimica Acta. 1981;64(4):1032-1039.
doi:10.1002/hlca.19810640409 .

Mihailović, Milhailo Lj., Lorenc, Ljubinka B., Pavlović, Vladimir D., Führer, Hermann, "Some Observations Concerning 1H‐NMR. Spectra of 5‐hydroxy‐ and 5‐acetoxy‐steroid compounds" in Helvetica Chimica Acta, 64, no. 4 (1981):1032-1039,
https://doi.org/10.1002/hlca.19810640409 . .