4-Cyclohexene-1 ,2-dicarboxylic

Cyclohexanone oxime, 32, 15 Cyclohexene, 31, 66 1-Cyclohexene-l-acetonitrile, 31, 25, 26 4-Cyclohexene-1,2-dicarboxylic... 

Cyclohexene-1,2-dicarboxylic ANHYDRIDE, cis-, 30, 93 Cyclohexene oxide, 32, 39, 40 Cyclohexene sulfide, 32, 39... 

Cyclopentenone annelation. The reaction of the dilithio derivative (2) of dimethyl 4-cyclohexene-1,2-dicarboxylate (LDA, THF/HMPT) with 1 at -45 -> 0° results in the bicyclic enone 3 in 72% yield. The reaction may involve conjugate addition of 2 to 1 to give a ketene (a) with loss of lithium phenoxide. Several other... 

Cyclohexanone, 2-hydroxymethyl-ene-, preparation of, 54, 38 reaction with alkylenedithio-tosylates, 54, 37 Cyclohexanone, 2,2-trimethy1-enedithio-, 54, 39 4-CYCLOHEXENE—1,2-DICARBOXYLIC ACID, DIETHYL ESTER, trans-, 50, 43... 

The catalyst was prepared from the corresponding chiral diol and TiCl2(OPr-/)2 at room temperature in the presence of 4 A molecular sieves. Without molecular sieves, stoichiometric amounts of the titanium complex were required to obtain an equally high enantioselectivity. A remarkable solvent effect was observed. Various cycloadducts were only obtained with high optical yields when non-polar solvents were employed252,253. For example, 4-substituted 4-cyclohexene-1,2-dicarboxylate derivatives 408 were obtained with ee values ranging from 91 to 94% in the reactions of 91a, 399 and 407 with 17b in toluene/... 

To improve the processability of PI and to alleviate or eliminate volatiles, work began in the late 1960 s under NASA Lewis sponsorship (23), to end-cap oligomers with reactive groups. The first report involved the use of 3,6-endomethylene-l,2,3,6-tetrahy-drophthalic anhydride (5-norbornene-2,3-dicarbo ylic anhydride, nadic anhydride) and alkyl derivatives thereof (e.g. citraconic anhydride) and 1,2,3,4-tetrahydrophthalic anhydride (4-cyclohexene-1, 2-dicarboxylic anhydride) as the reactive end group on imide oligomers (23-25). This initial effort led to the development of P13N [with T for polyimide, 13 for Mn of 1300g/mole and N for nadic end cap] whose structure is shown below. 

Diastereoselective ring opening of mono- and bicyclic anhydrides with sodium (S)-4-isopropyl-2-thioxothiazolidinide is an attractive alternative 10°. Aminolyses are carried out in tetrahydrofuran at low temperatures in a 1 1 molar ratio in the absence or presence of additives such as HMPA, TMEDA or DMSO. High yield and diastereoselectivity are recorded in the case of 4-cyclohexene-1,2-dicarboxylic anhydride. /... 

Cyclohexanedicarboxylic acid, diethyl ester, CIS-, 29 Cyclohexanone, 90 4-Cyclohexene-I, 2-dicarboxylic ACID, diethyl ester, CIS-, 29 4-Cyclohexene-1,2-dicarboxylic anhydride, CIS-, 93... 

Triethylamine (8) Ethanamine, N,N-diethyl- (9) (121-44-8) Diethyl trans-4-trimethylsiIyloxy-4-cycIohexene-1,2-dicarboxylate 4-Cyclohexene-1,2-dicarboxylic acid, 4-(trimethylsilyloxy)-, diethyl ester (8,9) (-)... 

HEXAHYDRO - 4a,5 - DIMETHYL - 2(3H) - NAPHTHALE-NONE and 2-TRIMETHYLSILYLOXY-1,3-BUTADIENE AS A REACTIVE DIENE DIETHYL trans -4-TRIMETHYL-SILYLOXY-4-CYCLOHEXENE-1,2-DICARBOXYLATE. Sulfur substitution also continues to be of high interest, and three preparations on sulfide synthesis are included BENZYL SULFIDE DIALKYL AND ALKYL ARYL SULFIDES NEOPENTYL PHENYL SULFIDE and UNSYMMETRICAL DIALKYL DISULFIDES sec-BUTYL ISOPROPYL DISULFIDE. 

Cyclohexene-1-acetonitrile, 31, 25, 26 4-Cyclohexene-1, 2-dicarboxylic ACID, DIETHYL ester, cis-, 30, 29 4-Cyclohexene-1,2-dicarboxylic ANHYDRIDE, cis-, 30, 93 Cyclohexene oxide, 32, 39, 40 Cyclohexene sulfide, 32, 39... 

The asymmetric hydrolysis of several cyclic meso-diesters has been accomplished and optically pure monoesters have been obtained. A classical example is the hydrolysis of dimethyl cis-4-cyclohexene-1,2-dicarboxylate, which affords the corresponding nearly optically pure half ester, a versatile synthon for various chiral cyclohexane derivatives (eq 3). ... 

C8H7CI03 4-chloro-4-cyclohexene-1,2-dicarboxylic anhy 14737-08-7 522.15 46.016 2 13151 C8H7N02 4-hydroxy-3-methoxybenzonitrile 4221-08-3 448.00 38.911 2... 

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