Accession Number:

ADA280841

Title:

Identification of the Stereoisomers of 1,2,3,4-tetramethyl-1,2,3,4- tetraphenylcyclotetrasilanes

Descriptive Note:

Technical rept.

Corporate Author:

CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF CHEMISTRY

Personal Author(s):

• Fossum, Eric
• Gordon, Scott
• Matyjaszewski, Krzysztof

Report Date:

1994-06-30

Pagination or Media Count:

24.0

Abstract:

The configuration of three synthetically available stereoisomers tttt, ttcc, and tctc of 1,2,3,4-tetramethyl-1,2,3,4- tetraphenylcyclotetrasilane have been unambiguously assigned using spin labeling techniques and by preparing chemical derivatives. 1JC-Si, 2JC-Si, and 3JC-Si values were determined for the three stereoisomers with 13C labeled methyl groups. The dominating isomer resulting from the synthesis possesses an all- trans structure and can be isolated in up to 95 purity.

Descriptors:

• *METHYL RADICALS
• *ISOMERS
• *PHENYL RADICALS
• *SILANES
• *CYCLIC COMPOUNDS
• OPENING(PROCESS)
• SYNTHESIS
• SILICON
• SPIN STATES
• CHEMICAL DERIVATIVES
• LABELED SUBSTANCES
• POLYSILANES
• RINGS
• CONFIGURATIONS
• PURITY
• STRUCTURES
• IDENTIFICATION

Subject Categories:

• Organic Chemistry
• Physical Chemistry
• Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE