共查询到20条相似文献,搜索用时 15 毫秒
1.
Robert W. Gray Armin Guggisberg Klaus Peter Segebarth Manfred Hesse Hans Schmid 《Helvetica chimica acta》1976,59(2):645-649
The Constitution of Loroglossine. Loroglossine, a characteristic constituent of orchids, is shown to be bis-[4-(β-D -glucopyranosyloxy)-benzyl]-(2 R, 3 S)-2-isobutyl-tartrate ( 1 ). Hydrolysis and esterification gave 1 mol-equiv. of dimethyl (+)-2-isobutyl-erythro-tartrate ((+)-3) and 2 mol.-equiv. of a glucoside which, after acetylation, gave 4 , identical with a synthetic sample. The erythro configuration of (+)- 3 by oxidation of isobutyl-maleic acid with osmium tetroxide and subsequent esterification. The absolute configuration of (+)- 3 was based on Horeau experiments and NMR. data of the diastereomeric mixture of its esters 7 and 8 with S (+)- and R (?)-α-phenylbutyric acid respectively. 相似文献
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3.
Nickel-catalysed Isomerization of Unsaturated Azocompounds Unsaturated azocompounds, produced by the nickel-catalysed reaction of butadiene with hydrazones, can be isomerized in presence of the same nickel catalyst. The influence of nickel concentration, temperature and structure of the azocompound on this rearrangement is described. 相似文献
4.
Heinz Falk Georges Hoornaert Hans-Peter Isenring Albert Eschenmoser 《Helvetica chimica acta》1975,58(8):2347-2357
Enol derivatives in the chlorophyll series. Preparation of 132,173-cyclopheophorbide enols 132,173-Cyclopheophorbide enols have been prepared as model systems for studying the effect of ring E enolization upon the properties of chlorophyll derivatives. 相似文献
5.
R. Scheffold 《Helvetica chimica acta》1967,50(5):1419-1422
For a number of nucleophiles L an approximate linear correlation between the logarithms of the stability constants of methylmercury-complexes of L and the nuclear spin-spin-coupling constants J of Ch3HgL was found. 相似文献
6.
The photoelectron spectra of cis-cycloalkenes (with three to ten carbon atoms in the ring), of three isomeric, non-conjugated cyclodecadienes, and of cis, cis, -1, 3-cycloalkadienes (with five to eight carbon atoms in the ring) have been recorded. The essential features of their π-bands and of the first σ-bands are briefly discussed. 相似文献
7.
3, 4-Diphenyl-sydnone ( 1a ) and 3-p-tolyl-4-phenyl-sydnone ( 1b ) on irradiation with a mercury high-pressure lamp in pyrex vessels yield 2,4,5-triphenyl- ( 3a ) and 2-p-tolyl-4,5-diphenyl-1,2,3-triazole ( 3b ), respectively. Irradiation of 1a and 1b in the presence of dimethyl acetylene-dicarboxylate or indene leads to the formation of the pyrazoles 4a and 4b and the Δ2-pyrazolines 5a and 5b , respectively. Reactive intermediates of the photoreaction of 1a and 1b seem to be the diazirines 2a and 2b , which open to give the 1,3-dipolar structures 8a and 8b . 相似文献
8.
P. Wieland 《Helvetica chimica acta》1970,53(1):171-173
A new method for the preparation of acetylenes by reating α-halogeno- or α-sulfonyloxyketones with p-toluenesulfonylhydrazine is reported. 相似文献
9.
Studies on the nickel-catalysed reaction of butadiene with hydrazones The nickel-catalysed reaction of butadiene with methyl-hydrazones yields a series of isomeric azo-compounds identified as 2:1 adducts. The products are compared with those of the analogous reaction of butadiene with imines (cf. Scheme 1–3). 相似文献
10.
Robert K. Müller Dorothee Felix J. Schreiber A. Eschenmoser 《Helvetica chimica acta》1970,53(6):1479-1484
The thermally induced fragmentations of the hydrazones derived from phenylglyoxal and the diastereomeric 2,3-diphenyl-1-amino-aziridines and 2,3-dimethyl-1-amino-aziridines proceed with high stereospecificity. 相似文献
11.
1,3,5,5-Tetramethylcyclohexa-1,3-diene, specifically deuterated in all positions except the gem.-dimethyl groups ( 11 ), was synthesized and found to undergo a rearrangement in the gas phase at 560°, which leads to a statistical distribution of the 6 hydrogen atoms to all 16 positions. This shows that the title compound ( 2 ) automerizes under these conditions and that the reaction proceeds via a series of ring openings (to 5 ) followed by degenerate [1,7]-H-shifts and rig closures (back to 2 ) rather than via [1,5]-CH3-shifts. It is suggested that the previously studied rearrangement of 5,5-dimethylcyclohexa-1,3-diene ( 1 ) to 1,5-dimethylcyclohexa-1,3-diene ( 3 ) takes its course by the same reaction pathway. 相似文献
12.
A 1, 6-addition of sulfonyl chloride isocyanate to 5, 7-dimethyl-8-methylidene-tricyclo[3.2.1.02,7]oct-3-en-6-one ( 1 ) produced the new tricyclic skeleton of 4a, 6-dimethyl-2, 5-dioxo-2, 3, 4a, 5, 6, 8a-hexahydro-1H-6, 4-methenoquinoline-1-sulfonyl chloride ( 2 ). The structure of the new aza-tricyclic species has been elucidated by X-ray analysis. 相似文献
13.
Fig. 1 illustrates a definition of the terms endocyclic and exocyclic SN-reactions, referring to intramolecular nucleophilic substitution processes that occur by an SN2-analogous mechanism. Crossing experiments show that the methyl transfer I → II (see scheme 1) does not follow the formally appealing mechanism of the endocyclic SN-process III; the reaction proceeds intermolecularly under all conditions investigated. Kinetic measurements indicate that the methyl transfer XI → XII (see scheme 3) occurs in a similar fashion. This behaviour is believed to follow from the preference of tetrahedral carbon for backside attack by the nucleophile in SN2-reactions. The general experience, according to which intramolecular reaction paths over cyclic transition states with ring sizes of 5 or 6 are preferred to their intermolecular counterparts, is not to be extrapolated to SN2-reactions at tetrahedral carbon. 相似文献
14.
Synthesis of muscaflavin A biomimetic type synthesis of the yellow dihydroazepine amino acid 5 isolated from fly agaric is achieved starting with carboxypyridyl alanine derivatives. 相似文献
15.
Hexanoic acid, heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, and dodecanoic acid are components of the trail pheromone of the ant species Lasius fuliginosus. The acids were extracted from the contents of the rectal ampullae and identified by the mass spectra and gas chromatographic retention times of the corresponding methyl esters. 相似文献
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The syntheses of 2,7-dioxa-isotwistane ( 14 ), 2,7-dioxa-twistane ( 19 ), and some of their derivatives ( 6 – 13 and 15 – 18 ) are described. The twistane-skeleton was obtained by a molecular rearrangement starting from the iodo-iso-twistane compound 8 . 相似文献
18.
Irradiation of 3-phenyl-2H-azirine ( 2 ) in benzene solution with a high-pressure mercury lamp yields 4,5-diphenyl-1,3-diazabicyclo[3,1,0]hex-3-ene ( 4 ) and not 3-phenylimino-4-phenyl-1-azabicyclo[2,1,0]pentane ( 1 ), as had been reported previously by others [2]. 2-Methyl-3-phenyl-2H-azirine ( 3 ) yields on irradiation a 2:1 mixture of 2-exo, 6-exo- and 2-exdo, 6-exo-dimethyl-4,5-diphenyl-1,3-diazabicyclo[3,1,0]hex-3-ene (2-exo,6-exo- and 2-endo, 6-exo- 5 ). Irradiation of 2,3-diphenyl-2H-azirine ( 8 ) leads to the formation of 2,4,5-triphenyl-imidazole ( 9 ) and tetra-phenylpyrazine ( 10 ). The suggested reaction path for the generation of 9 and 10 is shown in Scheme 2. 相似文献
19.
On Diels-Alder Reactions of the C60-Fullerene We report on the regioselective [4+2] cycloaddition of Buckminsterfullerene C60( 1 ) at room temperature with 2,3-dimethylbuta-1,3-diene and with the monoterpene 7-methyl-3-methylideneocta-1,6-diene (= myrcene) and on the spectroscopic characterization of the corresponding crystalling monoadducts 2 and 3 . According to these experiments, 1 acts as a reactive dienophile, which can be functionalized regioselectively under mild and controlled conditons. 相似文献
20.
The experimental results of our earlier investigation of the azodye bleach mechanism are interpreted in a revised manner. The reductive cleavage of methylorange by a dihydroquinoxaline proceeds in two steps. In the medium pH-range the first step (production of the hydrazo derivative) is slower (and not faster, as considered before) than the second (reductive splitting of the hydrazo derivative). In strongly acid solution this relation is reversed. The rate of disproportionation of the hydrazo derivative of methylorange is proportional to the concentration of the protonated hydrazo compound. For this reaction a two step mechanism is proposed in which a molecule of hydrazo compound is cleaved in a rate determining first step to an oxidizing particle and an amine molecule. In the following fast reaction the oxidizing intermediate attacks a second hydrazo molecule yielding methylorange and a further amine molecule. Based on this reaction sequence an azodye bleach mechanism is formulated which is able to explain the kinetics of the reductive cleavage of methylorange by a 1, 4-dihydroquinoxaline at any pH value. The azodye bleach mechanism is much more complex if the 1,4-dihydroquinoxaline used is able to form a radical or to tautomerize. The resulting reaction kinetics are discussed. 相似文献