Extending Distannoxane Double Ladders Using Rigid Spacers:  A Double Ladder with Eight Chiral Tin Atomsand a Twist

• Published in: Organometallics Vol. 21; no. 4; pp. 647 - 652
• Main Authors: Dakternieks, Dainis, Duthie, Andrew, Zobel, Bernhard, Jurkschat, Klaus, Schürmann, Markus, Tiekink, Edward R. T
• Format: Journal Article
• Language: English
• Published: WASHINGTON American Chemical Society 18.02.2002; Amer Chemical Soc
• Subjects: Chemistry; Chemistry, Inorganic & Nuclear; Chemistry, Organic; Physical Sciences; Science & Technology; HYDROXY; TIN(IV)-CATALYZED URETHANE FORMATION; ESTERIFICATION; TETRAORGANODISTANNOXANES; DIMERS; SOLID-STATE; CATALYSTS; CARBOXYLIC-ACIDS; TRANSESTERIFICATION
• ISSN: 0276-7333; 1520-6041
• DOI: 10.1021/om0105627

The new bulky silicon-containing ditin precursor p-(RCl2SnCH2SiMe2)2C6H4 (R = CH2SiMe3 (4)) has been synthesized and further reacted to form a unique double ladder {[p-(R(Cl)SnCH2SiMe2)2C6H4]O}4 (6). The two layers within 6 are twisted with respect to one another, resulting in a helical motif and a total absence of molecular symmetry so that there are eight chiral tin atoms within the system. The structure is compared to the double ladder {[m-(R(Cl)SnCH2CH2)2C6H4]O}4 (11), which was prepared from the less sterically demanding ditin precursor m-(RCl2SnCH2CH2)2C6H4 (10). The two layers within 11 are parallel, and the molecule contains only two kinds of tin atom.