Mass spectra of 4,4-dimethyl-A-homo-4a,6-cholestadien-3-ols, 4,4-dimethyl-A-homo-5-cholestene-3,4a-diols and their derivatives
1982 ◽
Vol 47
(10)
◽
pp. 2768-2778
Partial electron impact induced mass spectra are given of 3α-hydroxy-, 3β-hydroxy-, 3β-methoxy-, 3α-acetoxy- and 3β-acetoxy-4,4-dimethyl-A-homo-4a,6-cholestadienes, 3α,5α-epoxy-4,4-dimethyl-A-homo-5-cholestane, isomeric 4,4-dimethyl-A-homo-5-cholestene-3α(β),4aα(β)-diols, their 3-acetoxy derivatives and 3-methyl ethers. The fragmentation of the molecular ions of these substances involves the usual elimination of substituents (in the form of H2O, CH3OH, CH3COOH, CH2CO), but the most abundant and characteristic ions are products of the contraction of ring A (to a six- or five-membered one), accompanied by expulsion of a fragment containing the carbon atom C(4) with both methyls.
1979 ◽
Vol 57
(15)
◽
pp. 1995-2003
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Keyword(s):
1979 ◽
Vol 44
(12)
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pp. 3595-3603
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Keyword(s):
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1976 ◽
Vol 59
(3)
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pp. 622-632
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Keyword(s):
1982 ◽
Vol 47
(1)
◽
pp. 315-337
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Keyword(s):