Accession Number:

ADA280185

Title:

Reaction Channel Competition in Vibrational Overtone Activation: 1- Methylcyclopropene

Descriptive Note:

Technical rept. Sep 1993-Jun 1994

Corporate Author:

BOWLING GREEN STATE UNIV OH CENTER FORPHOTOCHEMICAL SCIENCES

Personal Author(s):

• Snavely, Deanne
• Grinevich, Oleg
• Hassoon, Salah

Report Date:

1994-06-03

Pagination or Media Count:

14.0

Abstract:

Laser vibrational overtone activation has been used to investigate the reaction channel competition in the isomerization of 1 -methylcyclopropene MCPene. The vibrational overtone activation of three types of CH stretches methyl, methylenic and olefinic in the 6vCH transition was initiated and all three products 2-butyne. 1,3-butadiene and 1,2-butadiene were detected by gas chromatography. Stern-Volmer plots have been constructed for the appearance of each individual product and the derived experimental specific rate coefficients compared to those of RRKM theory. Product ratios of 1,3-butadiene to 2-butyne were independent of pressure. These ratios were compared to the RRKM ratios. The product yield ratio for the methylenic photolysis compared well with the RRKM ratio but the olefinic product yield ratio was approximately 40 lower than the RRKM ratio. The implications of these comparisons are discussed.

Descriptors:

• *VIBRATION
• *METHYL RADICALS
• *PROPENES
• *CHEMICAL REACTIONS
• *CYCLIC COMPOUNDS
• *ACTIVATION ENERGY
• *CHANNELS
• RATIOS
• PHOTOLYSIS
• PRESSURE
• BUTADIENES
• ISOMERIZATION
• METHYLENES
• TRANSITIONS
• COEFFICIENTS
• LASERS
• RATES
• ACTIVATION
• COMPETITION

Subject Categories:

• Organic Chemistry
• Physical Chemistry
• Polymer Chemistry
• Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE