L- 2-Thienyl

UV, 6, 1032 (74JA4268) 47/-Thieno[3,4-c]pyrrol-5-ium-4-ide, 5-methyl-UV, 6, 1032 (74JA4268) 47/-Thieno[3,4-c]pyiTol-5-ium-4-ide, 5-phenyl-UV, 6, 1032 (74JA1817) l-(2-Thienyl)ethyl acetate kinetic data, 4, 952 (77AHC(21)119>... 

Buta-1,3-diene, 1 -(2 -furyl)-pyrolysis, 4, 600 Buta-1,3-diene, 1-mercapto-thiophenes from, 4, 887 Buta-1,3-diene, 1 -(1 -methyl-2-pyrrolyl)-thermal cyclization, 4, 285 Buta-1,3-diene, l-(2-thienyl)-electrocyclization, 4, 748 Butadienes... 

Quantitative measurements of the rate of acid catalyzed rearrangement of 3-methyl-l-(2-thienyl) allyl alcohol (178) to 1-methyl-3-(2-thienyl)allyl alcohol (179) showed that (178) rearranged forty times faster than the phenyl analog but about three times slower than the... 

Thermolysis of the l-(2-thienyl)-3-diazoalkenes 1 gives 3//-thieno[3,2-f]-l,2-diazepines 2 by sequential 1,7-dipolar electrocyclization and [l,5]-hydrogen shifts, together with 37/-pyrazoles 3, which are produced by a competing 1,5-cyclization.140... 

S-[2-nitro-l-(2-thienyl)ethyl]-N-tert-butoxycorbonyl-L-cysteine (VII)... 

Zinc complex formation with 1,3-diketones in aqueous solution has been investigated with pentane-2,4-dione, l,l,l-trifluoropentane-2,4-dione, and 4,4,4-trifluoro-l-(2-thienyl)butane-l, 3-dione. The buffer dimethylarsinic acid was shown to have a catalytic effect on complex formation with pentane-2,4-dione and the proton transfer reactions were affected.471,472 High-resolution solid state 13C NMR studies of bis(2,4-pentanedionato) zinc complexes have been carried out.473... 

The stereochemical characterization of the adduct 53 follows from its NMR spectrum and a comparison with that of the l-(2-thienyl) compound (54). The aSY-exo configuration for the adducts 51 and 52 is consistent with the NMR spectra (hydrogen atoms at C-2, C-3, C-5, and C-6 all equivalent), with the proposed mechanism of formation, and with the failure of the related tetramethyl ester to xmdergo N-acetylation even in very vigorous conditions. N-substituted derivatives of compounds such as 51-53 may be obtainable directly from similar dipolar cycloaddition reactions of mesoionic N-substituted oxazolium 5-oxides, although the formation of only the N-methyl derivative of (52) has so far been reported. ... 

An octahedral rhenium(III) complex of the composition [ReCl2(PPh3)2(0 0)] with the chelating 0 0 ligand 4,4,4-trifluoro-l-(2 -thienyl)butane-l,3-dionate has been prepared. The PPhs ligands are tram in this complex. 

Some l-(2-thienyl)-l-alkanols of type 45 can be efficiently resolved by acylation with vinyl butanoate catalyzed by CALB (Novozym 435) in various solvents (Scheme 4.19) [76]. 

Huffman (87) studied the transient emissions from terbium in a vinylic resin matrix. His compound was Tb tris-[4,4,4-trifluoro-l-(2-thienyl)-1,3-butaneodione] in polymethylmethacrylate. This may be conveniently abbreviated as TbTTA in PMMA. The compound EuTTA in PMM A had previously been reported by Wolff and Pressley (99) to give laser oscillation. Working with small fibers at 77°K, Huffman found distortions from the normal fluorescent decay curves when the optical pumping was large. He interprets this as evidence for stimulated emission. A comparison of these distorted decays with EuTTA in PMMA indicated a similar behavior, thus tending to substantiate his hypothesis. 

Vapour-phase vacuum pyrolysis of l-(2-thienyl)-l,3-butadiene (26) leads to 4,5-dihy-drobenzo[6]thiophene (27) (77TL151). The process involves an electrocyclization followed by a [l,5]-suprafacial sigmatropic H-shift. Thermolysis of 5-dimethylamino 2-(2-thienyl)-2,4-pentadienonitrile (28) results in electrocyclization and loss of dimethylamine to give the benzo[6]thiophene (29) in 80-100% yield (74AG(E)737). 

In all the reactions (except mercuration, for which the two reactions probably proceed by different mechanisms) the p-values for reactions at the thiophene nucleus are smaller (in absolute value) than those for the benzene reactions. For a critical evaluation of such data, consult (76AHC(20)l). The p-value for the solvolysis of l-(2-thienyl)ethyl p-nitroben-zoate and its nuclear substituted derivatives is -6.79 (the corresponding value for the benzene series being -5.7) (72JOC2615). Here [Pg.753]

Fluoro-l-(2-thienyl)prop-2-en-l-ol (2, R1 = H R2 = 2-thienyl) Typical Procedure 4... 

The rates of solvolysis of 4- and 5-substituted l-(2-thienyl)ethyl p-nitrobenzoates in 80% EtOH at 25° are correlated by a p value of —6.79,265 to be compared with —5.7 for the benzenoid reaction. Using o+ values calculated by the Dewar-Grisdale approach [Eq. (2)] incorporating q parameters derived from CNDO/2 or INDO molecular orbital procedures (which give closely similar results) gives a value of p of —7.14. For the equivalent 4-substituted l-(2-furyl)ethyl systems,266 267 however, the correlation with o is poor, p being —8.5. In this case Eq. (2) yields o+ values providing a close fit to experimental determinations with a p value that is appropriate for the benzenoid reaction. 

The first reported laser action in rare earth complexes was obtained by Lempicki and Samelson [656] for europium benzoylacetonate in alcoholic solution. The laser parameters for this complex have also been evaluated by Lempicki and coworkers [656, 660] who found a slightly better quantum efficiency (0.8) for europium benzoylacetonate than for ruby (0.7), the solid state laser. The laser action of europium benzoylacetonate has also been investigated by Schimitschek [661] and Bhatjmik et al. [662]. Some other complexes of Eu3+ viz. dibenzoylmethide [665,664], m-4,4,4-trifluoro-l(2-thienyl)-l,3-butanedione [665], thenoyl-trifluoroacetonate [666, 667] were also found to lase. 

Quinquethiophene gave an inclusion complex in perhydrotripheny-lene with emission at 2.52 and 2.37 eV (97CPL(278)146). The absorption and emission characteristics of a hetero-chalcone derivative, 3-(4 dimethylaminophenyl)-l-(2-thienyl)prop-2-en-l-one (59), in aqueous micellar solutions of sodium dodecy sulfate (SDS), cetyltrimethylammo-nium bromide (CTAB), and Triton X-100 (TX-100) as well as in (3-CD solutions were reported (08PPS257). 

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