
TY  - JOUR
A1  - Brown, RD 
A1  - Godfrey, PD 
A1  - Woodruff, M 
T1  - The Microwave Spectrum of Vinylketene
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1979
VL  - 32
IS  - 10
SP  - 2103
EP  - 2109
KW  - 
UR  - https://doi.org/10.1071/CH9792103C 
N2  - We have generated trans-vinylketene by pyrolysis of vinylacetic anhydride and measured and assigned its microwave spectrum. From the derived rotational constants the inertial defect is estimated to be 0.04 u&#506;2 (700 &#215; kg m2), which indicates a planar molecule. This, together with infrared and mass spectral data, identifies the compound as vinylketene rather than any of its isomers. We have confirmed that vinylketene is also produced by pyrolysis of 1-ethoxybut-3-en- 1-yne, but have found that it is not produced by the pyrolysis of 5-ethylidene-2,2-dimethyl-1,3-dioxan- 4,6-dione. The dipole moment of vinylketene is 0.97 D (3.24 &#215; 10-30 C m). An explanation of its lower magnitude as compared with other carbonyl compounds is offered in terms of &#960;-electron delocalization. 
ER  -

