Accession Number:

AD0270887

Title:

NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY. LONG-RANGE SPIN COUPLINGS IN VINYLACETYLENE

Descriptive Note:

Corporate Author:

CALIFORNIA INST OF TECH PASADENA GATES AND CRELLIN LABS OF CHEMISTRY

Personal Author(s):

• SNYDER,EUGEN I.
• ALTMAN,L.J.
• ROBERTS,JOHN D.

Report Date:

1961-12-01

Pagination or Media Count:

1.0

Abstract:

Theoretical couplings discussions must take into account the fact that the couplings are by no means negligibly small. This is clearly illustrated by the n.m.r. spectrum of the acetylenic proton of vinylacetylene in benzene solution under very high resolution. The couplings which correspond to the observed splittings are J sub 13 -2.40 cps, J sub 14 cis 0.80 cps, and J sub 14 trans 1.00 cps all 0.1 cps for vinylacetylene. The signs of the J values are relative to positive signs being taken for the couplings within the vinyl group. The reality of the long-range couplings in vinylacetylene was further confirmed beyond question by the proton spectrum of deuterated vinylacetylene, which substance showed the calculated simplification of the vinyl resonances expected for reduction of the magnitude of t e relevant couplings by a factor of seven the H to D gyromagnetic ratio. Author

Descriptors:

• *ACETYLENES
• *NUCLEAR MAGNETIC RESONANCE
• *VINYL RADICALS
• CHEMICAL BONDS
• DEUTERIUM COMPOUNDS
• MOLECULAR SPECTROSCOPY
• NUCLEAR SPINS

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE