Du, Mechanism of Base-Catalyzed Resorcinol - Formaldehyde and Phenol - Resorcinol-Formaldehyde Condensation Reactions
: A Theoretical Study, Polymers, 9, 426 (2017).
1-Butyl-3methylimidazolium hydroxide ([bmim]OH) is a kind of basic functionalized ionic liquid and has been successfully used for Knoevenagel condensation reaction
, Mannich reaction , Markovnikov addition reaction , Michael addition reaction [10,11], Feist-Benaryreaction , and cycloaddition reaction .
Hence, there is no C-C bond that needs to be broken down during condensation reaction
. Based on the above facts, the condensation reaction
of pyridine to quaternary nitrogen is likely to occur under the present conditions of pyrolysis at a temperature of 600 [degrees]C.
Boron condensation reaction
can occur not only at the liquid/solid interface but also in UHV systems.
The acid-catalyzed condensation reaction
proceeds by an initial protonation of the silanol followed by an [S.sub.N2] displacement reaction at the Si leading to formation of water and regeneration of the acid catalyst as depicted in Figure 12.
(19) reported silicone/titania thin films with RI of 1.64 by condensation reaction
of diphenyldimethoxysilane (DPS), GLYMO and tetrabutyl titanate (TBOT).
The aldol condensation reactions
follow the production of pentaerythritose forming the pentaerythritol by reaction kinetics.
They have assumed that condensation reactions
between the aromatic nucleus and the side chain occur during the irradiation.
In continuation of our previous studies and our attempts for synthesis of new derivatives [20-21], in this paper we aimed to synthesize some new derivatives by condensation reaction
of 4-hydrazinyl-3-nitrobenzopyran-2-one and aromatic aldehydes, and through other condensation reactions
, who could serve as parapharmaceutical products.
On the other hand, the condensation reaction
to form oligomers and polymers is not very reversible which is important for the water resistance of the product and makes it different from UF resin.
As a part of our current studies on development of efficient multicomponent reactions for the preparation of interesting bioactive molecules [19-22], especially the synthesis of pyrano[2,3-d]pyrimidine , we report here, a simple and efficient procedure for the synthesis of pyrano[2,3-d]pyrimidine via a one-pot, three-component condensation reaction
between 4-nitrobenzaldehyde 2, malononitrile 3, and thiobarbituric acid 1 in the presence of catalytic amounts of NaOAc 5mol% in a mixture of aqueous ethanol at 50[degrees]C (Scheme 1).
The condensation reaction
steps of TEOS in the WPUA solution were in the following sequence: nucleation, nucleus propagation forming colloids, and particle growth through colloid collision.