2-butenal, oxidation

BUTANAL, l-d—2-METHYL-, 51, 31 erythro-2,3-Butanediol monomesylate, by reaction of trans-2-butene oxide with methanesulfonic acid, 51, 11 3,5,1,7-[1,2,3,4]Butanetetrayl-naphthalene, decahydro-, 53, 30... 

Butene, 4-chloro-, 53, 119 trans-2-Butene oxide, from... 

A slight excess of fnms-2-butene oxide is used to assure complete utilization of methanesulfonic acid. The checkers experiments indicated that the use of a 15% excess of the epoxide substantially reduced the amount of unreacted methanesulfonic acid present in the product and did not appear to interfere with the succeeding steps of this procedure. 

Scheme 4 Synthesis of biock co-poiymer of PO and 1,2-butene oxide.

PO. In addition, the produced polymer does not include a phenolate terminal group which should be derived from 2a. These facts indicate that 2a does not initiate but accelerates the polymerization through coordination to PO. The living nature of the PO polymerization by using lb/2a system is advantageous for the production of a block co-polymer the polymerization of PO followed by addition of 1,2-butene oxide to the polymerization mixture gives diblock co-polymer with a narrow MWD (Scheme 4). 

As an active initiator for a co-polymerization, acyl-cobalt complexes also work well. As demonstrated by Alper and Lee, an equimolar mixture of Go2(GO)s, benzyl bromide (BnBr), and dihydro-1,10-phenanthroline 17, possibly generating BnGOGo(GO)4 under the reaction conditions, co-polymerized PO or 1,2-butene oxide with GO, and the... 

Synonyms 1-Butene oxide 1,2-butene oxide 1,2-butylene epoxide a-butylene oxide 1-butylene oxide epoxybutane ethyl ethylene oxide 2-ethyloxirane... 

The production of O( )) atoms is also evidenced by the formation of neopentanol in the photolysis of N20-neopentane mixtures at 2138 A. On the other hand, Of3P) atoms react with 1-butene to yield 1,2-butene oxide [Paraskevopoulos and Cvetanovic (791)]. 

Bawn and Skirrow (6) found that formaldehyde reduced the induction period in the gas phase oxidation of the simpler olefins such as propylene, 2-butene, and 1-hexene. Data for propylene are given in Table II. An analysis of the products from the reaction of 50 mm. of propylene and 140 mm. of oxygen at 340° C. gave the ratio of formaldehyde to total aldehyde to peroxide as 3 to 25 to 5 after a 7-minute induction period. 2-Butene, oxidized at 290° C. and a total pressure of 82.5 mm., gave formaldehyde, acetaldehyde, and acrolein as the aldehydic products, with formaldehyde, as in the case of propylene, appearing in relatively small amounts. 

For instance, the reaction of cis- and tra/w-2-butene oxide with aluminium chloride yields mainly erythro- and threo-chlorohydrin (after hydrolysis) respectively [66]. 

Another interesting monomer for copolymerisation with carbon dioxide is isomeric 2-butene oxide. In copolymerisation in a ternary comonomer system consisting of 2-butene oxide, 1-butene oxide and carbon dioxide with the diethylzinc-water catalyst, m-2-butene oxide was incorporated in the copolymer, while trans-2-butene oxide hardly underwent an enchainment [230]. Thus, the smaller steric hindrance for the r/.v-isomer than for the irans-isomer throughout the coordination copolymerisation with carbon dioxide is to be taken into account. 

Isomerization of epoxides to allylic alcoholsThis rearrangement has been effected with strong bases and various Lewis acids. Enantioselective rearrangement to optically active allylic alcohols can be effected with catalytic amounts of vitamin B, at 25°. Thus cyclopentene oxide rearranges to (R)-2-cyclopentene-l-ol in 65% ee. The rearrangement of the as-2-butene oxide to (R)-3-butene-2-ol in 26% ee is more typical. 

Poly(octene oxide) Poly(trans-2-butene oxide) Poly(styrene oxide) Poly(3-methoxypropylene oxide) Poly(3-butoxypropylene oxide) Poly(3-hexoxypropylene oxide) Poly(3-phenoxypropylene oxide) Poly(3-chloropropylene oxide) Poly[2,2-bis(chloromethyl)... 

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