2-Butenal, 2-methylSubject

Butenes were subjected to photosensitized reaction with molecular oxygen in methanol. 1-Butene proved unreactive. A single hydroperoxide, l-butene-3-hydroperoxide, was produced from 2-butene and isolated by preparative gas chromatography, Thermal and catalyzed decomposition of pure hydroperoxide in benzene and other solvents did not result in formation of any acetaldehyde or propionaldehyde. The absence of these aldehydes suggests that they arise by an addition mechanism in the autoxidation of butenes where they are important products. l-Butene-3-hydroperoxide in the absence of catalyst is converted predominantly to methyl vinyl ketone and a smaller quantity of methyl vinyl carbinol —volatile products usually not detected in important quantities in the autoxidation of butene. 

As described previously [63], P-ketoester 111 [Fig. (31)] was subjected to Baker s yeast reduction to afford the optically active P-hydroxyester 112 (60-80% yield). Dianion alkylation of 112 with (E)-3-methyl-4-(0-tert-butyldimehtylsilyl)-2-butene afforded the desired a-alkyl product 113 in 58-70% isolated yield. 

N 13 59% oxygen-rich monomer no props are reported except 1R spectrum was prepd by reaction of ethyl methyl ketone with formaldehyde, hydrogenation of the product with Gi chromite catalyst, acetylation to the triacetate, pyrolysis, deacerylation, and nitration of 3,3"bis(hydroxymethyl) -butene-1. The subject compd was synthesized as a binder constituent, which might be polymer-... 

Repetitive Alkylation Reaction. The tetrahydrofuran-insoluble materials, in certain instances, were subjected to a second alkylation reaction. In these cases there were three notable differences in the experimental results. First, the green color of the naphthalene radical anion and dianion persisted for a significantly longer time following the addition of the coal residue. Second, gas evolution, presumably butene-1, was detectable during the addition of butyl iodide or butyl mesylate but, significantly, not during the addition of methyl iodide. Third, the rate of formation of potassium iodide was much more rapid, such that the rate difference between butyl iodide and methyl iodide was not evident. 

Subjecting 4-hydroxybenzaldehyde 29 (R = H) to 3-methyl-2-butenal (30) in the presence of pyridine in a sealed glass tube to MWI for 25 min yielded chromene 31 in 68% yield. Under similar conditions, the condensation of 2,4-dihydroxybenzalde-hyde 29 (R = OH) with 30 gave chromenes 32 and 33 in 49% and 12% yields, respectively (99BCJ259). 

Another possibility for future in-depth consideration is whether the alkyl chains, which are considered to be indifferent of H-terminated Si surface, may be excited and subjected to bond formation with Si besides the reaction of double-bond end. This causes the formation of bridge type adsorbates, such as shown in Fig. lb. The photoadsorption of 1-butene on H Si(lll) did not yield CH3 vibrational signals, indicating that the original methyl end in 1-butene was destroyed [39]. The existence of a bridge type adsorbate on Si(lll) has not been recognized widely so far but it will be interesting to find a concrete method of preparation and to exploit its characteristic macroscopic properties. 

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