trans-2,4,9-Trimethylthioxanthene 10-oxide

trans-9-Ethyl-2,4-dimethylthioxanthene 10-oxide

“…The folding angle between the planes of the two benzo rings is 135.4 °, compared with 141.5 ° in the cis isomer of 9-ethyl-2,4-dimethylthioxanthene 10-oxide . As a comparison, the folding angle of 134.2 ° in the trans isomer (Chu, Grant, Napoleone, Ternay & Massah, 1981) of 2,4,9-trimethylthioxanthene 10-oxide is also smaller than that of 147.3 ° in the cis isomer (Chu, Rosenstein & Ternay, 1979 …”

cis-1,4,9-Trimethylthioxanthene 10-oxide, C16H16OS

“…The determination of the crystal structure of the title compound (I) is a continuation of the study of the effects of nonbonded interaction between the meso and para substituents on the conformation and configuration of thioxanthene derivatives. The crystal structures of cis and trans isomers of 2,4,9-trimethylthioxanthene 10-oxide (Chu, Rosenstein & Ternay, 1979;Chu, Grant, Napoleone, Ternay & Massah, 1981), and the cis and trans isomers of 9-ethyl-2,4-dimethylthioxanthene 10-oxide Chu & Napoleone, 1982) have been determined. The conformation and configuration of the 1,4-dimethyl substituted 9-alkylthioxanthenes will provide further information on the comparative effects of the paramethyl and 9-alkyl substituents on the conformation of the sulfinyl oxygen.…”