Structure and formation of gaseous [C4H5O]+ ions. I—isomeric ions of the type C3H5O

✍ Scribed by Henk Hommes; Johan K. Terlouw

• Publisher: John Wiley and Sons
• Year: 1979
• Tongue: English
• Weight: 518 KB
• Volume: 14
• Category: Article
• ISSN: 1076-5174
• DOI: 10.1002/oms.1210140113

✦ Synopsis

Characterization of [C,H,O]+ ions in the gas phase using theu+collisional activation 2pectra shows thTt the tour C3H&O komers CH,=C(CH,)E=O, CH,=CHCH,C=O, CH,CH=CHC=O and p C = O are stable fyr z= lo-' s. It is conciuded further from the characteristic shapes for the unimolecuiar !os of CO from C3H5C=+0 ions generated h m a series of precursor moledes that the CH-CH(CH3)kO-and CHz=CHCH$=O-type ions dissoaate over different potential surfaces to yield [aüyl]' and [2-propenyl]+ [C3H5]+ product ions respectively. Cyüopropyl carbonyl-type ions lose CO witb a large kUieJic energy release, which points to ring opening in the transition state, whereas this loss from CH,CH=CHC=O-type ions k proposed to OCEU via a rate determining 1,2-H shiit to yield 2-propenyl cations.