Reactions of Carbon Vapor. I. Reactions of Triatomic Carbon with Olefins

Abstract

A major component of carbon vapor is C%. The chemical properties of this substance were studied at -196°in additions to olefins, the products being bisethanoallenes.Relative rates show C3 to be a nonselective dicarbene for olefin additions and yet it does not show insertion properties. In a paraffin hydrocarbon matrix at -196°, C3 is stable. This variety of C3 adds stereospecifically to cis-and trans-2-butenes, confirming the conclusion from spectroscopic analysis of the Swings bands that the ground state is singlet. Nonstereospecificity is observed with simultaneous deposition at -196°o f C3 and the 2-butenes, indicative of a hitherto unobserved triplet state C3; limits of 10_1 to 10~5 seer1 have been placed on the half-life for decay of this triplet state to a singlet state.

Application of carbon arc‐generated Mo‐ and W‐based catalyst systems to the ROMP of norbornene

“…[15] The carbon arc was used to produce carbon vapor at low pressures (ca 5 × 10 −3 Torr) by intermittent arcing (16 V ac) between two graphite electrodes (60 mm in length separated by ca 1-2 mm) and condensed on the liquid nitrogen cooled walls. Since extremely high temperatures (>2000…”

“…In previous work, [14] we carried out olefin metathesis reactions of selected acyclic olefins with WCl 6 using a carbon arc reactor. [15] A carbon arc reactor was used to generate a W-carbene species [eqn (1)]. Energetic carbon atom vapors formed in the carbon arc reactor can insert into single bonds.…”

The formation of amino acid precursors in the reaction of atomic carbon with water and ammonia at 77 K

“…The carbon arc reactor is modeled after that described by Skell et al [19]. Carbon is vaporized under high vacuum (10 .4 torr) by striking an arc between two high purity graphite rods attached to water cooled brass electrodes.…”

2-Chloro-1,4-benzodithiin 1,1,4,4-Tetraoxide – A Conjunctive Dienophile for the Preparation of Tetrasubstituted Polycyclic Olefins

“…izing carbon in an arc, [5] reacts with most classes of compounds [6] such as alcohols, ketones, aldehydes, alkanes, alUnsaturated polycyclic hydrocarbons of types 1؊3 are kenes, and ethers, showing radical behavior.…”

“…[1a] [2] [3] [4] [5] [6] [7] molecules of interest both from the synthetic and theoreti-Research in this area has been further stimulated in recent cal points of view. They exhibit peculiar geometrical and years by the discoveries of the fullerenes, where C 2 has been electronic features, as in the case of sesquinorbornene 4 [1] postulated to play a role in their formation.…”