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A mixture of cis-decalin and CXB can simultaneously match optical index and density of PMMA. [1] Due to the moderate dielectric constant of CXB (ε = 7.9 [2]), PMMA acquires charges that can be screened by the addition of salt (e.g. tetrabutyl ammonium bromide), leading to a very good approximation of colloidal hard sphere. [3]
Very often, cis–trans stereoisomers contain double bonds or ring structures. In both cases the rotation of bonds is restricted or prevented. [4] When the substituent groups are oriented in the same direction, the diastereomer is referred to as cis, whereas when the substituents are oriented in opposing directions, the diastereomer is referred to as trans.
trans-1,3-Disubstituted cyclohexanes are like cis-1,2- and cis-1,4- and can flip between the two equivalent axial/equatorial forms. [ 2 ] Cis -1,4-Di- tert -butylcyclohexane has an axial tert -butyl group in the chair conformation and conversion to the twist-boat conformation places both groups in more favorable equatorial positions.
The 3 substrates of this enzyme are cis-1,2-dihydroxy-4-methylcyclohexa-3,5-diene-1-carboxylate, NAD +, and NADP +, whereas its 4 products are 4-methylcatechol, NADH, NADPH, and CO 2. This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-CH group of donor with NAD+ or NADP+ as acceptor. The systematic name of ...
cis-1,2-Dihydrocatechol is the organic compound with the formula C 6 H 6 (OH) 2. Several isomers exist with this formula. It is a colorless solid melting near room temperature. The compound is classified as a 1,3-cyclohexadiene. It arises by the dihydroxylation of benzene catalyzed by toluene dioxygenase.
Other names in common use include cis-benzene glycol dehydrogenase, cis-1,2-dihydrocyclohexa-3,5-diene (nicotinamide adenine, and dinucleotide) oxidoreductase. This enzyme participates in 4 metabolic pathways : gamma-hexachlorocyclohexane degradation , toluene and xylene degradation , naphthalene and anthracene degradation , and styrene ...
Thus, the two substrates of this enzyme are cis-1,2-dihydronaphthalene-1,2-diol and NAD +, whereas its 3 products are naphthalene-1,2-diol, NADH, and H +. This enzyme belongs to the family of oxidoreductases , specifically those acting on the CH-CH group of donor with NAD+ or NADP+ as acceptor.
However, conformationally constrained systems like cis-1,2-divinyl cyclopropanes can undergo the rearrangement in the boat conformation. It is currently generally accepted that most Cope rearrangements follow an allowed concerted route through a Hückel aromatic transition state and that a diradical intermediate is not formed.