36291-48-2Relevant articles and documents
Synthesis, identification and application of aldehyde reactive dyes
Chen, Xiao,Ding, Keyi,Jun, Liu
, p. 404 - 412 (2015)
Nine aldehyde reactive dyes, designated D1- D9, were synthesized. Among them, D1 and D2 were synthesized by "grafting" alizarin red and alizarin yellow GG, respectively, to the α-C of n-butyl-aldehyde; D3 and D4 were synthesized by "grafting" alizarin red and alizarin yellow GG, respectively, to the methyl-C of 4-methyl-cinnamaldehyde; D5- D9 were synthesized by "grafting" alizarin red, alizarin yellow GG or self-prepared colorants to the α-C of glutaraldehyde. UV-Vis, FTIR, ESI-MS, elemental analysis and 1H NMR were applied to identify the target products. Aluminum-tanned wet-white sheep leather was chosen as substrate for the application experiments, and their four dyeing property indexes, i.e., substantivity (S), exhaustion (E), fixation (F) and reactivity (R) were measured. The results indicated that, without adding of neutral salts and under mild conditions (T = 35-45 °C, pH = 4.0-6.5), all these dyes could dye wet-white leather within 1.5 h, and the dyed leather possessed a satisfactory washing-fastness.
Synthesis of 1-arylcycloalkenamines by intramolecular arylation of lithiated ureas
Tait, Michael B.,Ottersbach, Philipp A.,Tetlow, Daniel J.,Clayden, Jonathan
, p. 1245 - 1252 (2014)
The deprotonation of N′-arylurea derivatives of cyclohexenamines by alkyllithiums leads to migration of the N′-aryl substituent from N′ to the allylic position α to N via rearrangement of a urea-stabilised allyllithium intermediate. The product ureas may be solvolysed to reveal 1-arylcyclohexenamines.
Catalytic Living Ring Opening Metathesis Polymerisation: The Importance of Ring Strain in Chain Transfer Agents
Liu, Peng,Yasir, Mohammad,Kilbinger, Andreas F. M.
supporting information, p. 15278 - 15282 (2019/09/17)
A recently developed catalytic living ring opening metathesis polymerisation (ROMP) was investigated using a series of reversible chain transfer agents (CTA) carrying either cyclopentene or cyclohexene rings, differing only in ring strain. All cyclopentene derivatives examined showed significantly faster reaction rates than the corresponding cyclohexene derivatives. This resulted in lower molecular weight dispersities and better control of the molecular weight for the cyclopentene compared to the cyclohexene CTAs. Both Grubbs’ second and third generation catalysts could be employed in catalytic living ROMP using cyclopentene CTA derivatives. The kinetics of different CTAs were studied, block copolymers were synthesised and residual ruthenium quantified by ICP-OES. All polymers were fully characterised by NMR, GPC and MALDI-ToF mass spectrometry. The new cyclopentene CTAs are readily synthesised in a few straightforward steps and provide faster reaction kinetics than all previously reported reversible CTAs.
Synthesis of pentacyclic compounds via intramolecular [3 + 2] photocycloaddition of cycloalkene linked naphthalenes
Maeda, Hajime,Uesugi, Tomoya,Fujimoto, Yasufumi,Mukae, Hirofumi,Mizuno, Kazuhiko
, p. 198 - 206 (2017/02/10)
Intramolecular photocycloaddition reactions of cycloalkene linked naphthalenes lead to formation of pentacyclic compounds in a high yielding and stereoselective manner. Intramolecular [2 + 2] cycloadducts are formed initially in photoreactions of cycloalkene linked 1-cyanonaphthalenes. The initially formed intramolecular [2 + 2] cycloadducts absorb light at wavelengths used to promote the photochemical reactions and, as a result, they undergo efficient photocycloreversion to regenerate the starting substrates. In a less efficient competing process, the cycloalkene linked 1-cyanonaphthalenes react to form [3 + 2] intramolecular photoadducts, which do not absorb incident light under the conditions used. Consequently, these photoadducts become the major products in these processes. The relative configuration of the major diastereomers of the pentacyclic products formed from photoreactions of cyclopentene linked naphthalenes (cis-cis) differ from those (cis-trans) arising from the cyclooctene linked substrates. The results of theoretical calculations, which show that steric factors govern the preferred facial mode of intramolecular addition, are in good agreement with the stereochemical course of these photoreactions.
