28467-92-7Relevant academic research and scientific papers
P-Toluene sulfonic acid (PTSA)-MCM-41 as a green, efficient and reusable heterogeneous catalyst for the synthesis of jasminaldehyde under solvent-free condition
Ganga, Venkata Subba Rao,Abdi, Sayed H.R.,Kureshy, Rukhsana I.,Khan, Noor-Ul H.,Bajaj, Hari C.
, p. 264 - 271 (2016/05/19)
This paper reports the synthesis of p-Toluene sulfonic acid (PTSA)-MCM-41 by impregnation method and its characterization XRD, FT-IR, TGA, N2 adsorption-desorption isotherms, SEM, and TEM. The impregnated catalysts were used to catalyse cross-aldol condensation of active methylene bearing aliphatic aldehydes with aromatic aldehydes under solvent and metal-free condition particularly in the synthesis perfumery chemical-jasminaldehyde and related compounds. The as synthesized catalyst PTSA-MCM-41 has displayed high efficiency (selectivity up to 91%) in catalyzing cross-aldol condensation reaction and was reusable (5 cycles) with no apparent loss in activity. The catalytic performance of PTSA-MCM-41 was compared with other catalysts viz., ZnO, proline, proline-LDH, PTSA, PTSA-zirconia and PTSA-zeolite where PTSA-MCM-41 showed better performance particularly in synthesis of jasminaldehyde.
Bifunctional organocatalysts for the synthesis of jasminaldehyde and their derivatives
Ganga, Venkata Subba Rao,Abdi, Sayed H.R.,Kureshy, Rukhsana I.,Khan, Noor-Ul H.,Bajaj, Hari C.
, p. 950 - 955 (2017/08/04)
L-Proline in the presence of benzoic acid is found to be an effective catalytic system for the cross-aldol condensation of benzaldehyde with 1-heptanal under solvent free condition amongst the several amino acids screened for this reaction. Under the optimized reaction conditions, the desired product (e.g. jasminaldehyde) is formed up to 96% selectivity in one hour using the desired arylaldehyde: 1-alkanaldehyde ratio as low as 2:1 under controlled addition of 1-alkanaldehyde.
Highly enantioselective bioreduction of 2-fluorocinnamyl alcohols mediated by Saccharomyces cerevisiae
Luo, Fan,Wang, Ping,Gong, Yuefa
supporting information; experimental part, p. 1693 - 1695 (2010/04/29)
Biocatalytic reduction of 2-fluorocinnamyl alcohols mediated by Saccharomyces cerevisiae was investigated in phosphate buffer solutions. Product analysis clearly showed that (S)-2-fluoro-3-arylpropanols were afforded in high yields with up to 92% ee value.
Pd-catalyzed oxidative amidation of aldehydes with hydrogen peroxide
Suto, Yutaka,Yamagiwa, Noriyuki,Torisawa, Yasuhiro
, p. 5732 - 5735 (2008/12/22)
Using hydrogen peroxide as a key oxidant, catalytic oxidative amidation between aldehydes and amines was effectively carried out with PdCl2-xantophos as a catalyst in methanol under acidic conditions. The new protocol is mechanistically different from the previous one through β-hydride elimination.
Reactions of trimethylsilyl-derived iodohydrins with electron-rich π-systems
Ishai, Eti,Shamai, Sarit,Feit, Ben-Ami
, p. 434 - 438 (2007/10/03)
Reactions of trimethylsilyl-derived iodohydrins of the type R1R2CH-CH(I)OTMS, with electron-rich olefins, and the effects of certain factors on these reactions, were studied. The trimethylsilyl-derived iodohydrins were obtained in situ by reacting R1R2CH-CHO (R1 = R2 = H; R1 = H, R2 = alkyl, phenyl) with TMSI. The corresponding trimethylsilyl enol ether derivatives (R1R2C=CH-OTMS), and 1,1-diarylethylenes were the olefins used. Aldehydes of the type RCH2-CH=O reacted smoothly in the presence of TMSI to yield the condensation product RCH2-CH=C(R)-CH=O. Both RCH(-CH=CAr2)2 and the cyclic acetal 5 were obtained as main products of the RCH=O-TMSI-CH2=CAr2 reaction system, depending on the [RCHO]:[TMSI]:[CH2=CAr2] concentration ratio. The mechanisms of formation for the various main products and by-products are discussed. TMSI substitutes, formed by reacting Me3SiCl with each of several Lewis acids, were also used.
Action of Boron Trifluoride on Aromatic Acetals
Alphonse, I.,Arulraj, S. J.
, p. 199 - 200 (2007/10/02)
Acetals of the type X-C6H4CH(OR)2 (where R = Et, n-Bu and isoamyl and X = H, CH3) react with boron trifluoride in anhyd. 1,2-dichloroethane to give benzyl alkyl ethers, α,β-unsaturated aldehydes and benzaldehyde.However, p-nitrobenzaldehyde di-n-butyl acetal gives only p-nitrobenzaldehyde.The formation of benzyl alkyl ethers is explained by a hydride ion transfer mechanism and that of α,β-unsaturated aldehyde by an aldol-type of condensation.
ETHERS D'ENOLS β-LITHIES; SYNTHESES D'ALDEHYDES α-ETHYLENIQUES
Duhamel, Lucette,Tombret, Francis,Mollier, Yves
, p. 1 - 16 (2007/10/02)
β-Bromoenol ethers readily undergo bromine-lithium exchange with t-butyllithium in ether or THF at -70 deg C.The resulting lithium products react with aldehydes and ketones to produce, after hydrolysis, β-hydroxyenol ethers (basic medium) or α-unsaturated aldehydes (acidic medium).
