Identification of 1,2,2,5-tetramethyltetralin and 1,2,2,5,6-pentamethyltetralin as racemates in petroleum
作者:Robert Alexander、Trevor P. Bastow、Robert I. Kagi、Raj K. Singh
DOI:10.1039/c39920001712
日期:——
1,2,2,5-Tetramethyltetralin and 1,2,2,5,6-pentamethyltetralin have been synthesized and identified as recemates in crude oil and are proposed from dehydrogenation experiments as intermediates in the formation of alkylnaphthalenes in crude oil.
The structures of compounds X and Y, two labdane diterpenoids, from Leonotis leonurus
作者:E. R. Kaplan、D. E. A. Rivett
DOI:10.1039/j39680000262
日期:——
The structures of compoundsX, C20H28O5, and Y, C20H28O3, fromLeonotisleonurus have been elucidated. Both possess a labdane skeleton. CompoundX is a dilactone containing a cyclic ether linkage and compoundY is an αβ-unsaturated ketone related to marrubiin, with which it has been correlated through a common degradation product.