TY - JOUR AU - Uozumi, Yasuhiro; Hirata, Shuichi TI - Synthesis of (Non)symmetrical Ureas Catalyzed by Sulfated Polyborate SN - 1861-1958 SN - 1861-194X PY - 2018 JF - Synfacts LA - EN VL - 14 IS - 01 SP - 0104 DA - 2017/12/15 KW - solvent-free KW - amines KW - ureas KW - benzimidazolones PB - © Georg Thieme Verlag DO - 10.1055/s-0036-1591024 UR - http://www.thieme-connect.com/products/ejournals/abstract/10.1055/s-0036-1591024 ER -