Enhancement of Discrimination Ability for cis- and trans-Decalins through Side-chain Ordering in Comb-shaped Polymer

2010 ◽  
Vol 39 (8) ◽  
pp. 844-845 ◽  
Author(s):  
Atsuomi Shundo ◽  
Abul K. Mallik ◽  
Hisaki Nakashima ◽  
Makoto Takafuji ◽  
Shoji Nagaoka ◽  
...  
Keyword(s):  
Side Chain ◽  
Discrimination Ability ◽  
Cis And Trans ◽  
Chain Ordering

Cyclic side-chain-linked opioid analogs utilizing cis - and trans -4-aminocyclohexyl- d -alanine

2014 ◽  
Vol 22 (23) ◽  
pp. 6545-6551 ◽  
Author(s):  
Justyna Piekielna ◽  
Luca Gentilucci ◽  
Rossella De Marco ◽  
Renata Perlikowska ◽  
Anna Adamska ◽  
...  
Keyword(s):  
Side Chain ◽  
Cis And Trans

scholarly journals GC-MS Metabolite Profile and Identification of Unusual Homologous Cannabinoids in High Potency Cannabis sativa

Planta Medica ◽  
2020 ◽  
Vol 86 (05) ◽  
pp. 338-347 ◽  
Author(s):  
Josep Basas-Jaumandreu ◽  
F. Xavier C. de las Heras
Keyword(s):  
Cannabis Sativa ◽  
Metabolite Profile ◽  
Side Chain ◽  
High Potency ◽  
Double Bond Migration ◽  
Phytochemical Investigation ◽  
Branched Chain ◽  
Fragmentation Patterns ◽  
Cis And Trans ◽  
Tms Derivatives

AbstractPhytochemical investigation of the lipids extracted from seeds of Cannabis sativa by GC-MS showed 43 cannabinoids, 16 of which are new. The extract is dominated by Δ9-tetrahydrocannabinolic acid (A) and its neutral derivative trans-Δ9-tetrahydrocannabinol-C5 (THC) Cis and trans-Δ9-tetrahydrocannabinol-C7 isomers with an ethyl-pentyl branched chain together with minor amounts of trans-Δ9-tetrahydrocannabinol with a methyl-pentyl C6 branched side chain were identified as new natural compounds. Four cannabichromene isomers with a C5 side chain are postulated to be derived from the double bond migration at the terminal isoprenyl unit. C7 cannabichromene together with the neutral and acidic forms of cannabinol-C7 were also detected. The mass spectrum of these homologues as trimethylsilyl (TMS) derivatives are presented, and the fragmentation patterns are discussed.

Reductive cleavage of 2-alkoxy- and 2-aryloxy-tetrahydropyrans with LiAlH4–AlCl3

1967 ◽  
Vol 45 (21) ◽  
pp. 2547-2558 ◽  
Author(s):  
U. E. Diner ◽  
R. K. Brown
Keyword(s):  
Ring Cleavage ◽  
Side Chain ◽  
Resonance Spectroscopy ◽  
Trans Isomers ◽  
Aryl Group ◽  
Side Chain Cleavage ◽  
Chain Cleavage ◽  
Cis And Trans Isomers ◽  
Steric Factors ◽  
Cis And Trans

A series of 2-alkoxy- and 2-aryloxy-tetrahydropyrans has been hydrogenolyzed in ether by LiAlH4–AlCl3. As the alkyl group attached to the exo oxygen atom is changed from primary to tertiary, the proportion of ring cleavage to side-chain cleavage increases. Only side-chain cleavage occurs with the 2-aryloxytetrahydropyrans. The results are explained in terms of the polar properties of the alkyl or aryl group attached to the ring oxygen or the side-chain oxygen. Any control by steric factors is considered to be submerged by the polar effects, but does have a clearly apparent directive effect when the polar factors are equal for the two routes of cleavage. The results of the hydrogenolysis of 6-substituted 2-alkoxytetrahydropyrans could be explained on the same basis.The configurations of the cis and trans isomers of the disubstituted tetrahydropyrans were determined by nuclear magnetic resonance spectroscopy. Their conformational preference is discussed.

Five-coordinate iron(II) porphyrins derived from meso-α,β,γ,δ tetraphenylporphin: synthesis, characterization, and coordinating properties

1979 ◽  
Vol 57 (14) ◽  
pp. 1804-1813 ◽  
Author(s):  
Michel Momenteau ◽  
Bernard Loock ◽  
Emile Bisagni ◽  
Michel Rougee
Keyword(s):  
Metal Ion ◽  
Side Chain ◽  
Intramolecular Coordination ◽  
Trans Isomers ◽  
Visible Spectroscopy ◽  
Cis And Trans Isomers ◽  
The Stability ◽  
Heterogeneous Reduction ◽  
Cis And Trans ◽  
Reduced Forms

Meso-α,β,γ,δ, tetraphenylporphin derivatives bearing acrylic (cis and trans isomers) and propionic side chains with a terminal imidazole group have been synthesized. Intermediate compounds obtained during their preparation were characterized by visible spectroscopy and nmr. In non-coordinating solvents (benzene or toluene), the iron(III) complexes of these compounds do not show intramolecular coordination of the terminal base on the metal ion. The reduced forms of the compounds have been obtained from ferric forms by heterogeneous reduction with aqueous dithionite and exhibit optical spectra characteristic of five-coordinate ferrous complexes. The nitrogenous bases and carbon monoxide affinities of the latter have been measured and the results indicate that the 'transinfluence' exerted by the terminal imidazole does not depend greatly on the nature and the structure of the covalent side chain. In contrast the stability of the five-coordinate compounds depends on the side chain (trans acrylic < propionic < cis acrylic) as suggested by the values reported for the replacement constants of the terminal imidazole by 4-cyanopyridine in unsymmetrical six-coordinate derivatives. The stability of these compounds towards oxidation is also reported.

scholarly journals Backbone and side-chain ordering in a small protein

2008 ◽  
Vol 128 (2) ◽  
pp. 025105 ◽  
Author(s):  
Yanjie Wei ◽  
Walter Nadler ◽  
Ulrich H. E. Hansmann
Keyword(s):  
Side Chain ◽  
Small Protein ◽  
Chain Ordering

Adduct Intermediates in the Side-chain Nitration of 1,4-Dimethylnaphthalene

1972 ◽  
Vol 50 (24) ◽  
pp. 3988-3992 ◽  
Author(s):  
Alfred Fischer ◽  
Alan Leslie Wilkinson
Keyword(s):  
Acetic Acid ◽  
Nitric Acid ◽  
Acetic Anhydride ◽  
Room Temperature ◽  
Methylene Chloride ◽  
Side Chain ◽  
Trans Isomers ◽  
Cis And Trans Isomers ◽  
Cis And Trans ◽  
Naphthyl Acetate

cis and trans isomers of 1,4-dimethyl-4-nitro-1,4-dihydro-1-naphthyl acetate (1) have been isolated from a mixture of 1,4-dimethylnaphthalene and nitric acid in acetic anhydride by quenching at −40°. At room temperature only 1-methyl-4-nitromethylnaphthalene (4) is obtained. The conversion of 1,4-dimethylnaphthalene to 4 and of the cis (1a) and trans (1b) adducts to 4, by nitric acid in acetic anhydride, has been followed by n.m.r. 1,4-Dimethyl-4-nitro-1,4-dihydro-1-naphthyl nitrate (5) appears to be the immediate product from nitration of 1,4-dimethylnaphthalene in acetic anhydride, methylene chloride, or nitromethane. In acetic anhydride 5 is converted into 1. Decomposition of 1 in acetic acid gives 1,4-dimethyl-2-naphthyl acetate and some 4. The formation of 4 in this reaction is suppressed by urea.

Nucleation and Growth of P(NDI2OD-T2) Nanowires via Side Chain Ordering and Backbone Planarization

2021 ◽  
Vol 54 (5) ◽  
pp. 2143-2154
Author(s):  
Kefeng Zhao ◽  
Qiang Zhang ◽  
Liang Chen ◽  
Tao Zhang ◽  
Yanchun Han
Keyword(s):  
Nucleation And Growth ◽  
Side Chain ◽  
Chain Ordering
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