Sulfur trioxide pyridine complex is the compound with the formula C5H5NSO3. It is a colourless solid that dissolves in polar organic solvents. It is the adduct formed from the Lewis base pyridine and the Lewis acid sulfur trioxide. The compound is mainly used as a source of sulfur trioxide, for example in the synthesis of sulfate esters from alcohols:

CAS：26412-87-3
中文别名：三氧化硫-吡啶复合物;吡啶-三氧化硫复合物;吡啶三氧化硫;硫磺三氧吡啶络合物;氧化硫吡啶复合物;
英文别名：(DIMETHYLAMINOMETHYL)STYRENE;Active Sulfure Trioxide;sulfur trioxide pyridine;Sulfur Trioxide - Pyridine Complex;PyridineSO3;SO3*pyridine complex;sulfur trioride-pyridine;Sulfur trioxide pyri;VINYLBENZYLDIMETHYLAMINE;sulfur(VI) oxide-pyridine complex;Pyridine - Sulfur Trioxide Complex;N,N-DIMETHYLVINYLBENZYLAMINE;pyridine/sulfur trioxide complex;Sulfur trioxide pyridine complex;sulfur trioxide-pyridine complex;
分子式：C5H5NO3S
分子量：159.163
精确质量：158.999
Psa：96.19
Logp：1.3734

BRN号：3704116
MDL号：MFCD00012437
EINECS号：247-683-3

外观与性状：白色至米色粉末
沸点：115.3ºC at 760 mmHg
熔点：~160°C
闪点：20ºC
水溶解性：reacts
稳定性：Stable under normal temperatures and pressures.
储存条件：Keep container closed when not in use. Store in a cool, dry, well-ventilated area away from incompatible substances. Keep away from water.
蒸汽压：22.8mmHg at 25°C

安全说明：S26-S36/37/39-S45
危险类别码：R22; R34
WGK Germany：3
海关编码：29420000
危险品运输编码：UN 3261 8/PG 2
危险类别：8
包装等级：II
危险品标志：C
危险性防范说明：P280; P305 + P351 + P338; P310
信号词：Danger
危险标志：GHS05, GHS07
危险性描述：H302; H314

生产方法
用吡啶与氯磺酸在室温下反应制得。 用作氧化剂及磺化剂。
用途
用作氧化剂及磺化剂。