Dimethylphenylsilane CAS 766-77-8

DMP, as a hydrogen containing silane crosslinking agent, is widely used in room temperature vulcanization (RTV) and high temperature vulcanization (HTV) silicone rubber systems. It undergoes addition reactions with vinyl silicone rubber through Si-H bonds to achieve crosslinking and curing, significantly improving the comprehensive performance of silicone rubber.
Improving heat resistance: Introducing phenyl groups increases the thermal decomposition temperature of silicone rubber to over 400 ℃, far exceeding that of ordinary dimethyl silicone rubber (about 250 ℃), and is suitable for high-temperature environments such as aerospace and automotive engines.

DMP is an important modifier for high-performance silicone sealants/adhesives in the fields of construction, automotive, and electronics. By enhancing adhesive strength, thermal stability, and weather resistance, it significantly extends the product's service life.
Enhanced adhesion performance: Si-H bonds can react with hydroxyl groups on the surface of inorganic substrates (glass, metal, concrete) to form strong Si-O-M bonds, solving the problem of weak adhesion of ordinary silicone adhesives to metal/glass.

DMP, as a monomer of phenyl silicone resin, is co hydrolyzed and condensed with methyl trichlorosilane and dimethyl dichlorosilane to prepare methyl phenyl silicone resin, which is used in high-temperature resistant coatings, insulation paints, anti-corrosion coatings and other fields.
High temperature resistant insulation paint: used for insulation impregnation of motors, transformers, and electronic components, with a heat resistance level of H (above 180 ℃), high insulation resistance, and chemical corrosion resistance.

DMP, with its low viscosity, high insulation, good adhesion, and heat resistance, has become a key component of electronic component potting materials and packaging adhesives, used to protect precision electronic devices such as chips, circuit boards, sensors, etc. from moisture, dust, vibration, and high temperature damage.
Chip level packaging: used for bottom filling and encapsulation of power semiconductors, LED chips, and integrated circuits, reducing thermal stress, improving heat dissipation efficiency, and long-term reliability.

DMP, as a silane coupling agent and surface modifier, is used for surface treatment of inorganic/organic materials to enhance interfacial compatibility, hydrophobicity, and weather resistance.
Surface treatment of fillers: Surface modification of inorganic fillers such as glass fiber, white carbon black, calcium carbonate, mica, etc. to improve their dispersibility in organic silicon/organic polymers and enhance the mechanical strength and heat resistance of composite materials.

DMP, as a mild and highly selective hydrogen source, can reduce various carbonyl compounds with high stereoselectivity under fluoride ion catalysis or metal synergy, avoiding excessive reduction, and is irreplaceable in complex molecular synthesis.
Reduction of α - aminoketone to amino alcohol: Highly stereoselective generation of threo amino alcohol, a key step in the synthesis of chiral drugs such as β - receptor blockers and antidepressants, with selectivity>95%.
Reduction of aldehydes/ketones to alcohols: Under the catalysis of fluoride ions (such as TBAT), aldehydes and ketones are mildly reduced to primary/secondary alcohols without affecting functional groups such as esters, amides, nitro groups, halogens, etc. The selectivity is superior to LiAlH ₄ and NaBH ₄.

DMP undergoes hydrosilylation with olefins and alkynes catalyzed by platinum (Pt) and palladium (Pd) to form alkyl/vinylsilane, which is the core reaction for the synthesis of organic silicon intermediates and functional molecules.
Addition with styrene: generates β - phenylethyldimethylphenylsilane, which is used to synthesize organosilicon modified polystyrene resin to enhance heat resistance and weather resistance.

DMP reacts with alcohols and phenols to form dimethylphenylsilyl ether (DMP-OR) under dehydrogenation coupling conditions. As a hydroxyl protecting group, DMP-OR has the advantages of high stability and mild removal conditions, and is widely used in complex organic synthesis.
Protecting hydroxyl groups: Under MOF catalysts such as Cu ∝ (BTC) ₂, it efficiently couples with alcohols/phenols, and the protecting group is stable to acids, bases, and oxidants. It can be gently removed under the action of fluoride ions (such as TBAF) without affecting other functional groups.
Application scenario: In the synthesis of natural products and pharmaceutical intermediates, it is used to protect the hydroxyl groups in sugar, steroid, and alkaloid molecules and avoid side reactions.

DMP undergoes dehydrogenation coupling under metal catalysis to form 1,3-diphenyl-1,3,3-tetramethyldisiloxane, or undergoes dehydrogenation cross coupling with alcohols/phenols to form silicon oxygen bonds, which is an important pathway for the synthesis of siloxane polymers and functional molecules.
Uniform coupling reaction: Under the catalysis of Cu ∝ (BTC) ₂, DMP is efficiently uniformly coupled to disiloxane with a yield of>90%. The product is an important crosslinking agent and plasticizer for silicone resin and silicone rubber.
Cross coupling reaction: coupling with phenols and alcohols to generate aryloxy/alkoxysilane, used for the synthesis of fragrances, pharmaceutical intermediates, and surfactants.