In the functional chlorosilane intermediate spectrum, the combination of "two Si–Cl highly active hydrolysis" and "terminal chloromethyl (–CH₂Cl) nucleophilic substitution site" jointly dictates its role as a building block for α-silane coupler synthesis, silicon-bearing pharma active scaffolding, and agrochemical sila-modification precursor. Ordinary methyltrichlorosilane has no organic function end, only crosslinker; γ-chloropropyltrimethoxysilane has Cl but at γ-position with weak substitution. As chloromethyltrimethoxysilane, amino/mercapto/epoxy α-silanes, silicon-side-chain antitumor drugs demand "dual Si–Cl fast hydrolysis + chloromethyl substitutable + small-molecule distillable," sourcing a chloromethylmethyldichlorosilane CAS 1558-33-4, bp 121.5℃, density 1.277, MW 163.5 has become the core gap for domestic dual-live chlorosilane localization.
Addressing this "Si-Cl + CH₂Cl dual-live" pain point,
Anhui IOTA Silicone Oil Co., Ltd. (IOTA) officially launches
Chloromethylmethyldichlorosilane IOTA 5160 (Chloromethylmethyldichlorosilane / Dichloro(chloromethyl)methylsilane, CAS 1558-33-4, C₂H₅Cl₃Si, MW 163.5, EINECS 216-319-5). Characterized by "colorless transparent volatile liquid, 99% pure, bp 121.5℃, density 1.277g/cm³ (20℃), 10/20/200L PE drum," and backed by "dual Si–Cl hydrolytic condensation + chloromethyl nucleophilic substitution + methyl steric stable-distill," it serves as the "dual-live chlorosilane anchor" for α-silane coupler synthesis, pharma/agro silicon intermediates, and specialty silicone resin mod.
Molecular Architecture: Si-DiCl + C-CH₂Cl Dual-Site Reactive Logic
The core competitiveness of IOTA 5160 stems from its asymmetric dihalosilane "Si bonded to CH₃ + CH₂Cl + two Cl, carbon-end –CH₂Cl" structure:
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Dual Si–Cl High-Active Hydrolysis: Two Si–Cl bonds rapidly hydrolyze with water/alcohol releasing HCl, forming silanediol then siloxane; alcoholysis with anhydrous MeOH/EtOH gives corresponding dimethoxy/diethoxy silane—direct precursor to chloromethylmethyldimethoxysilane (downstream α-silane core); hydrolysis rate far above mono-Si–Cl silanes, fits continuous alcoholysis.
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Chloromethyl Nucleophilic Substitution: C-end –CH₂Cl undergoes SN2 with –NH₂/–SH/–CN/–OH/azide, bridging "siloxane skeleton" and "organic function" in one step, avoiding γ-chloropropyl three-carbon spacer, suited to synthesize α-functional silanes (α-aminomethyl, α-mercaptomethyl).
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Methyl Steric Stable-Distill: One methyl left on Si (not three Cl) keeps dual-Cl high activity yet methyl sterics slow self-poly, bp locked 121.5℃ (760mmHg), precision fractionation to 99% meets pharma-grade consistency.
Performance Leap: From "Mono-Halogen Crude Use" to "Dual-Live Precision Block"
Using IOTA 5160 as intermediate enables qualitative leaps downstream:
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α-Silane Coupler Synthesis: Alcoholysis → chloromethylmethyldimethoxysilane → amination/thiourea/epoxidation yields α-aminomethyl/α-mercaptomethyl/α-epoxy dimethoxy silanes for epoxy/PU/acrylic adhesion promotion—shorter interface, better heat than γ-series.
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Pharma Silicon Side-Chain: CH₂Cl → azide → amine gives aminomethyl, attached to nucleoside/steroid for silicon-bearing antiviral/anticancer precursors; siloxane segment lifts lipophilic/hydrophilic balance and metabolic stability.
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Agro Silane Active: Condenses with OH/SH pesticide APIs to make sila-modified herbicides/fungicides, improving leaf spreading and systemicity.
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Specialty Silicone: Co-hydrolyzes with Me₂SiCl₂ to chloromethylated silicone resin, later aminated to cationic silicone oil or quaternized antibacterial silicon surface.
Application Penetration: From α-Silane to Silicon-Pharma Intermediate
IOTA 5160 covers sectors doubly sensitive to "Si–Cl + C–Cl dual substitution":
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Silane Coupler Industry: Chloromethyltrimethoxysilane, α-amino/mercapto/epoxy silane synthesis feedstock.
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Pharma Intermediate: Silicon drug building block, silyl protecting group, antitumor side-chain precursor.
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Agrochemicals: Sila-pesticide modification, foliar adjuvant intermediate.
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Specialty Silicones: Cationic silicone oil, antibacterial silicon surface, chloromethylated silicone resin.
IOTA Technical Guide: Absolute-Dry Explosion-Proof, N₂ Cold Store
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Alcoholysis to Dimethoxy: Anhydrous MeOH, 0-5℃ dropwise add IOTA 5160, base (pyridine/Et₃N) traps HCl, get chloromethylmethyldimethoxysilane, vacuum distil; no water-bearing alcohol, prevents HCl burst.
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Chloromethyl Substitution: Gabriel (phthalimide K) to aminomethyl, thiourea to mercaptomethyl, NaCN to cyanomethyl; solvent DMF/THF, water/acid-free.
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Taboo Red Line: Violent hydrolysis with water releasing HCl (R14), flash ~35℃ flammable (R10), corrosive to skin/eye (R34), toxic inhale (R20); no open air, no mix-store with water/alcohol/amine; GHS 02/05/06, UN2985 or UN2927 class, manage as corrosive flammable hazardous.
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Storage: 10/20/200L PE drum (N₂ blanket), cool dry ventilated <25℃ dark sealed; shelf per plant std (ref peer 12 months strict-seal); operation needs explosion-proof vent, impermeable gloves, goggles, respirator; leak absorb with dry sand, no water flush.
Industry experts note that under α-silane coupler localization and silicon-bearing drug/agro active R&D warming, chloromethylmethyldichlorosilane is upgrading from "niche chlorosilane" to "dual-live sila-building-block reference intermediate." IOTA 5160, with its "99% pure + 121.5℃ narrow-boil + Si–Cl/CH₂Cl dual-site" hard metrics,
fills the domestic supply chain gap for chloromethylmethyldichlorosilane in α-silane and pharma-intermediate fields, providing a mass-producible path to replace imported Momentive CFS-334, TCI C1358 for downstream coupler/pharma-chem enterprises. This confirms domestic chlorosilane intermediates are advancing steadily along "dual-halogen high-active → chloromethyl substitutable → pharma-grade high-pure," with growing technical say in organosilicon-pharma cross building blocks.
