191231-69-3

Basic information

• Product Name: Silane, trimethyl[4-[2-[[tris(1-methylethyl)silyl]ethynyl]phenyl]-1,3-butadiynyl]-
• CAS NO: 191231-69-3
• Molecular Formula: C24H34Si2
• Molecular Weight: 378.705
• Mol File: 191231-69-3.mol

Chemical Properties

• CAS DataBase Reference: Silane, trimethyl[4-[2-[[tris(1-methylethyl)silyl]ethynyl]phenyl]-1,3-butadiynyl]-(CAS DataBase Reference)
• NIST Chemistry Reference: Silane, trimethyl[4-[2-[[tris(1-methylethyl)silyl]ethynyl]phenyl]-1,3-butadiynyl]-(191231-69-3)
• EPA Substance Registry System: Silane, trimethyl[4-[2-[[tris(1-methylethyl)silyl]ethynyl]phenyl]-1,3-butadiynyl]-(191231-69-3)

Safety Data

• Hazardous Substances Data: 191231-69-3(Hazardous Substances Data)

Upstream product

• 89343-06-6 tris-iso-propylsilyl acetylene 
• 351389-18-9 1-bromo-2-(4-trimethylsilyl-1,3-butadiynyl)benzene 
• 1066-54-2 trimethylsilylacetylene 
• 188003-93-2 triisopropyl((2-((trimethylsilyl)ethynyl) phenyl)ethynyl)silane 
• 4526-06-1 trimethylsilyl-1,3-butadiyne 
• 583-55-1 1-Bromo-2-iodobenzene 

Downstream Products

• 97976-81-3 1,4-bis(2-ethynylphenyl)buta-1,3-diyne 
• 214628-17-8 C₅₀H₅₆Si₂ 

Relevant articles and documents

Dynamic Figure Eight Chirality: Multifarious Inversions of a Helical Preference Induced by Complexation

We demonstrate two types of inversion of a helical preference upon the 1:1 complexation of a dynamic figure eight molecule with a guest molecule through the controlled transmission of point chirality. We designed a series of macrocycles that prefer a nonplanar conformation with figure eight chirality. These macrocycles are composed of a chirality-transferring unit (terephthalamide) and a structure-modifying unit (two o-phenylene rings spaced with a varying number of triple bonds). The former unit provides a binding site for capturing a guest molecule through the formation of hydrogen bonds. The attachment of chiral auxiliaries to the former unit induces a helical preference for a particular sense through the intramolecular transmission of point chirality. For relatively small-sized macrocycles, the preferred sense was reversed upon complexation with an achiral guest. Contrary preferences before and after complexation were both seen for chiral auxiliaries associated with a figure eight host through two-way intramolecular transmission of the single chiral source. Alternatively, the helical preference induced in relatively large-sized macrocycles was reversed only when a figure eight host formed a 1:1 complex with a particular enantiomeric guest through the supramolecular transmission of point chirality in the guest. This stereospecific inversion of a helical preference is rare.

A versatile synthetic route to dehydrobenzoannulenes via in situ generation of reactive alkynes

This paper outlines the development of a protocol that allows in situ generation of unstable alkynes under Pd-catalyzed cross-coupling conditions. Cu-mediated intramolecular cyclization of the resultant α,ω-polyynes provides dehydrobenzoannulenes as singular species, in very good overall yields, and in a variety of topologies that are inaccessible by traditional routes or previously available in low yield only. In addition, we will discuss the solid-state structure and reactivity of these macrocycles, as well as the ability of the planar dehydrobenzoannulenes to support weak induced ring currents.