Results 71 to 80 of about 433,597 (216)

Electronic effects in the electron ionization fragmentations of 2‐aryl substituted octahydro‐1,3‐ and ‐3,1‐benzoxazines

, 1993
The 70 eV electron ionization mass spectra of 27 2-aryl substituted octahydro-1,3- and -3,1-benzoxazines have been recorded in order to find out how the site and stereochemistry of the ring fusion and especially the nature of the substitutent X on the 2 ...
Fülöp Ferenc, Bernáth Gábor, Vuorilehto Lauri, Lehtela Pirjo-Liisa, Pihlaja Kalevi, Vainiotalo Pirjo   +5 more
core   +1 more source

2,6-Bis(2-methyl-1,3-diazinan-2-yl)-pyridine

, 2010
The title compound, C15H25N5, is an aminalization product between 2,6-diacetyl­pyridine and 1,3-diamino­propane. It crystallizes with two independent mol­ecules in the asymmetric unit with different conformations.
Bolte, Michael, Quoc-Cuong Ton, Michael Bolte, Cuong, Ton Quoc   +3 more
core   +1 more source

New synthetic uses for chiral 1,3-dioxolan-4-ones

, 2008
The behaviour of chiral 1,3-dioxolan-4-ones, derived from reaction of mandelic and lactic acid with pivalaldehyde, as chiral acyl anion equivalents has been examined.
Power, Lynn A.
core  

Novel Latent Catalyst for Ring-Opening Polymerization of 1,3-Benzoxazines Triggered by a Dual Ionic/Non-ionic Monomer Partnership

Macromolecules, 2023
Magdalena Stępień, Aleksandra Marszałek-Harych, M. Gazińska, A. Ga̧gor, Ł. John, J. Ejfler   +5 more
semanticscholar   +1 more source

Aromatic diamine-based benzoxazines and their high performance thermosets

, 2014
Four high-purity aromatic diamine-based benzoxazines (13-16), which could not easily be synthesized by traditional approaches, were successfully synthesized by a facile, widely useful three-step synthetic method using four typical aromatic diamines - 4,4'
Lin, C.H., Chang, S.L., Hsieh, C.W., Lee, H.H., 林慶炫   +4 more
core   +1 more source

Kinetic solvent effects on 1,3-dipolar cycloadditions of benzonitrile oxide [PDF]

, 2005
The kinetics of 1,3-dipolar cycloadditions of benzonitrile oxide with a series of N-substituted maleimides and with cyclopentene are reported for water, a wide range of organic solvents and binary solvent mixtures.
Jan B. F. N. Engberts, Theo Rispens, Engberts, JBFN, Engberts, Jan B.F.N.,, Rispens, Theo,, Rispens, T   +5 more
core   +1 more source

Investigation of Antimicrobial Activity of 1,3-benzoxazine Derivatives [PDF]

Biopolymers and Cell, 2019
S. P. Zahorulko, S. A. Varenichenko, O. K. Farat, I. V. Markova, V. I. Markov   +4 more
openaire   +1 more source

Phenolic Naphthoxazines as Curing Promoters for Benzoxazines

, 2018
The effect of phenolic hydroxyl bearing naphthoxazines as catalysts for the ring-opening polymerization (ROP) of simple 1,3-benzoxazines was investigated.
Baris Kiskan (743416), Yusuf Yagci (743419), Gizem Kaya (4865902)   +2 more
core   +1 more source

Gas-Phase ring-chain tautomerism in 1,3-oxazines. Does it exist?

, 1991
Gas-phase ring-chain tautomeric equilibria with eight 2-phenyl-substituted perhydro-1,3-oxazines and six 2-arylsubstituted 1,2-dihydro-4H-3,1-benzoxazines were studied by recording their mass spectra under different conditions.
Fülöp Ferenc, Pihlaja Kalevi, Vainiotalo Pirjo   +2 more
core   +1 more source

Aerial Oxygen-Driven Selenocyclization of O-Vinylanilides Mediated by Coupled Fe³⁺/Fe²⁺ and I₂/I^- Redox Cycles. [PDF]

Molecules, 2022
Zhang HY, Zeng TT, Xie ZB, Dong YY, Ma C, Gong SS, Sun Q.   +6 more
europepmc   +1 more source