Results 41 to 50 of about 22,823 (226)
Synthesis of Cyclobutane Serine Analogues
The Journal of Organic Chemistry, 2004 In this paper, we describe a thermal [2 + 2] cycloaddition involving 2-acylaminoacrylates as electron-poor acceptor alkenes, a reaction that involves a Michael-Dieckmann-type process. The reaction gives rise to a new substituted cyclobutane skeleton that can be transformed into amino acid derivatives.
Avenoza, A. +3 more
openaire +4 more sources
The Molecular Structure of Cyclobutane [PDF]
, 1952 The cyclobutane molecule has been found by electron diffraction to have the following bond distances and bond angles: C–C, 1.568±0.02A; C–H, 1.098±0.04A; ∠HCH, 114±8°.
Dunitz, J. D., Schomaker, Verner
core +1 more source
Repair, abort, ignore? Strategies for dealing with UV damage [PDF]
, 2011 DNA repair is a prominent member of the nuclear transactions triad (replication, transcription, and repair). Sophisticated mechanisms govern the cellular process of decision-making (to repair or not to repair, to proceed with cell cycle or not and ...
Khalil, Hilal S. +2 more
core +3 more sources
Synthetic studies towards d-modified paclitaxel analogues [PDF]
Journal of the Serbian Chemical Society, 2012 A synthetic sequence has been developed for the preparation of 9,10-O-diacetyl-4-desmethylene-4β-(3-butenyl)-4α-hydroxy-5-O-mesyltaxicin I-1,2-carbonate 3, an intermediate in the attempted synthesis of cyclobutane paclitaxel analogue.
Matović Radomir +2 more
doaj +1 more source
Generalized "Quasi-classical" Ground State for an Interacting Two Level System
, 2004 We treat a system (a molecule or a solid) in which electrons are coupled linearly to any number and type of harmonic oscillators and which is further subject to external forces of arbitrary symmetry.
Asher Yahalom +16 more
core +1 more source
X-ray structures of dinuclear copper(I) and polynuclear copper(II) complexes with the 2,4-bis(cyanamido)cyclobutane-1,3-dione dianion [PDF]
, 2006 From the 2,4-bis(cyanamido)cyclobutane-1,3-dione dianion (2,4-NCNsq2−), two copper complexes [Cu2(PPh3)4(PhCN)2(μ-2,4-NCNsq)] · PhCN (1) and [Cu(dien)(μ-2,4-NCNsq) · H2O]n (2) have been synthesized and characterized by IR and electronic absorption ...
Cortadellas, Olivier +4 more
core +2 more sources
A biorenewable cyclobutane-containing building block synthesized from sorbic acid using photoenergy
iScience, 2022 Summary: A novel cyclobutane-containing diacid building block, CBDA-3, was synthesized from sorbic acid using clean, efficient [2 + 2] photocycloaddition.
Micah Mabin +4 more
doaj +1 more source
Advanced Functional Materials, EarlyView.Flow through a nozzle is a common component of most fluid‐based polymer processing techniques such as spray drying, inkjet printing, extrusion. An ultrahigh molecular weight multi‐mechanophore system is used to probe the differences in the distribution of mechanical activation observed between nozzle flow and ultrasonication; the gold standard ...
Niamh Willis‐Fox +4 more
wiley +1 more source
1,3-Bis(4-methylbenzoyl)-2,4-bis(2,4,5-trimethoxyphenyl)cyclobutane
IUCrData, 2017 The title compound, C38H40O8, possess an inversion centre at the centroid of the four-membered ring. The dihedral angle between the methylbenzene and trimethoxybenzene rings is 46.19 (8)°.
K. R. Raghavendra +5 more
doaj +1 more source
Acta Crystallographica Section E: Crystallographic Communications, 2020 Recrystallization of (E)-5-phenyl-1-(pyridin-2-yl)pent-2-en-4-yn-1-one at room temperature from ethylene glycol in daylight afforded [3,4-bis(phenylethynyl)cyclobutane-1,2-diyl)bis(pyridin-2-ylmethanone], C32H22N2O2 (3), while (E)-5-(4-methylphenyl)-1 ...
Ivan E. Ushakov +5 more
doaj +1 more source