A series of (hydroxymethyl)hydroxyphenyldimethylsiloxanes of linear and branched structures were synthesized by the reaction with formaldehyde in aqueous alkaline medium of organosilicon phenols of general formula R'[Si(CH 3 ) 2 O] n [Si(CH 3 )RO] m SiMe 2 R', where R' was 4-hydroxy-3-methoxyphenylpropyl, R was methyl or 4-hydroxy-3-methoxyphenylpropyl. The structure and composition of the siloxanes were confirmed by elemental analysis, NMR and IR spectroscopy. The homocondensation of (hydroxymethyl)hydroxyphenyldimethylsiloxanes at the hydroxymethyl groups was investigated. A possibility of reaction of (hydroxymethyl) hydroxyphenyldimethylsiloxanes with phenol-formaldehyde resin to form copolymers was demonstrated.The organosilicon compounds containing reactive phenol groups at the silicon atom are of interest as the starting monomers and oligomers for obtaining various silicon-containing polymers [1]. It is reasonable to use the organosilicon phenols as modifiers of organic resins and compositions for adding properties of heat and frost resistance, water repellency, etc. to organoelemental and organic materials [2][3][4]. A method for production of organosiloxane phenolic resins based on the products of high-temperature condensation of alkoxysilanes and siloxanes with organic bisphenols has been claimed [5]. A synthesis of copolymers by polycondensation of organosilicon phenols with organic hydroxymethylphenols was reported [6]. The (hydroxymethyl)hydroxyphenyldimethylsiloxanes containing both phenol and hydroxymethyl functional groups have been described [7].In this paper we discuss the features of the method of synthesis and properties of carbofunctional (hydroxymethyl)hydroxyphenyldimethylsiloxanes of linear and branched structure. The presence in their structure of hydroxymethyl and phenol reactive groups enhances their performance as a source reagents for the synthesis of copolymers and modifiers of organic polymers.Synthesis of (hydroxymethyl)hydroxyphenyl-dimethylsiloxanes was performed by hydroxymethylation of the organosilicon phenols [4] of general formula R'[Si(CH 3 ) 2 O] n [Si(CH 3 )RO] m SiMe 2 R', where R' is 4-hydroxy-3-methoxyphenylpropyl group, R is methyl or 4-hydroxy-3-methoxyphenylpropyl group, with formaldehyde in aqueous alkaline medium.
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