HCID 53734901, compound → HCID 53734900, compound

Participants

Reaction Steps

The product (482 g) obtained in (1) above was dissolved in ether (10 l). The resulting solution was subjected to the measurement of UV spectrum with a spectrophotometer (cell length; 1 cm, wavelength; 340 nm-200 nm). The UV spectrum showed, as maximum absorbance (λmax), 293, 281, 271, 260 (shoulder), 249.5 (shoulder), 241 and 232. From the ratio of absorbance in λmax ; 281 and 240, the ratio (Δ5,7/Δ4,6) of 1α,3β-diethoxycarbonyloxy-25-hydroxycholesta-5,7-diene to 1α,3β-diethoxycarbonyloxy-25-hydroxycholesta-4,6-diene was 4.36.

Provenance & Evidence