Hexene cyclohexene

The hydrogenation of simple alkenes, such as hexene, cyclohexene, cyclo-hexadiene and benzene, has been extensively studied using biphasic, alternative solvent protocols. These hydrocarbon substrates are more difficult to hydrogenate compared to substrates with electron withdrawing groups. Benzene and alkyl substituted aromatic compounds are considerably more difficult to hydrogenate... 

In addition, phenylsufonylallene (110), a,(3-unsaturated phosphonates (111), and alkenes with perfluorinated substituents (112) are all useful dipolarophiles. The yields observed with methyl 2-propenoate are significantly lower than those with the corresponding acrylate (entries 7 and 9), because of the additional substituent. On the other hand, the dipolar cycloadditions with either ethyl vinyl ether, 1-hexene, cyclohexene, or a trisubstituted dipolarophile provide the corresponding isoxazolidines in either low yields or not at all (18). 

RhCl3 H20 Poly-4-vinylpyridine cross-linked polystyrene substituted with Me2N-, Me2NCH2-, Me2NCH2CH2- 1- Hexene 2- Hexene Cyclohexene 57... 

The experiments in Tables I and II have dealt with the reactions of 1-hexene only. It is known that hydroformylation rates for various olefins are in the order, 1-hexene > 2-hexene > cyclohexene (15). Little dependence on structure would be expected in the aldehyde hydrogenation step, however. 

Acid-catalyzed liquid-phase fluorine addition with xenon difluoride to cis and trans 1-phenylpropene resulted in the formation of vicinal difluoride in high yield63. Photo-initiated reaction in methylene chloride at 0 °C also gave vicinal difluorides in a nonstereospecific manner, and a free-radical mechanism was suggested68. Unfortunately, this radical reaction does not appear to represent a general synthesis since reaction with 1-hexene, cyclohexene and 2,3-dimethyl-2-butene does not give vicinal difluoride products68. 

A-halo electrophiles (TV-halo amines, A-halo amides and iV-halo imides) react with alkenes such as 1-hexene, cyclohexene and styrene in the presence of boron trifluoride to give halofluorides and A-halo adducts (equation 34)51. These types of reactions have been dis-... 

With this catalyst alkenes such as 1-hexene, 2-pentene, 3-hexene, cyclohexene, 2,3-dimethyl-2-butene, styrene, allyl alcohol, allyl cyanide and acrylamide, are reduced under mild conditions. Rates of... 

Halometallation is rare with the early transition metals. Stable solutions of TiCl4- (CR=CR Cl) are obtained from the reaction of TiCU with alkynes . Both and Z isomers are present in solution. More useful are the reactions in CH2CI2 of molybdenum chlorides, M0CI5, M0O2CI2 and M0OCI4, with alkenes (hexenes, cyclohexenes, etc.), to form exclusively cis-chlorination products in 92% yields. ... 

Several observations suggest that HC1 absorption to form a hydridorhodium catalyst is not the mode of activation seen in the 1-hexene, cyclohexene, and thylene hydrogenations discussed a-bove. First, PS-S03 H2NMe2, which is a good HC1 absorber, does not activate any of these alkene hydrogenations with or without ethylene pretreatment. Second, addition of neutral alumina (another HC1 absorber) or powdered KOH at KOH/Rh molar ratios of 20/1 was ineffective at producing a rate acceleration under our conditions. Larger ratios of KOH/Rh (e.g. 100/1) did accelerate... 

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