As nouns the difference between mercaptal and mercaptan
is that mercaptal is (obsolete|chemistry) a dithioacetal derived from an aldehyde while mercaptan is mercaptan.
mercaptal
English
Noun
(
en noun)
(obsolete, chemistry) a dithioacetal derived from an aldehyde
mercaptan
English
Noun
(
en noun)
(chemistry) Any of a class of organic compounds of sulphur, ( R1.S.R2 ); they tend to be foul-smelling. When R2 is a hydrogen atom, they are termed thiols or thioalcohols.