![]() ![]() ![]() Three of the four stereoisomeric 2-methyl-1-thioniabicyclo(4.4.0)decanes have been prepared and their sterostructures assigned by /sup 13/C NMR. Unstabilized sulfonium ylides were prepared and their interconversion by pyramidal inversion of sulfur has been investigated activation parameters for the conversion were found to be. Activation parameters for inversion of salt 1a are found to be. Stereostructures have been assigned by a combination of /sup 13/C NMR, 360-MHz /sup 1/H NMR, and single-crystal x-ray analysis of salt 9 (X/sup -/ = 1/sup -/). The 6-methoxycarbonyl analogue 9 has also been prepared. ![]() Eastman's sulfonium salt, 1-thioniabicyclo(4.4.0)decane tetrafluoroborate, has been prepared by an improved process and shown to be an equimolar mixture (molecular compound) of trans and cis steroisomers 1a and 1b, each of which has been isolated in pure form. ![]()
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