Boron trifluoride molecular structure

It is especially important to investigate the molecular structure of coordination compounds in the vapor phase because the relatively weak coordination interactions may be considerably influenced by intermolecular interactions in solutions and especially in crystals. It has been shown that the geometrical variations can be correlated with other properties of the molecular complexes ). In particular the structural changes in the F3B N(CH3)3 and CI3B N(CH3)3 molecules ) relative to the respective monomeric species unambiguously indicated boron trichloride to be a stronger acceptor than boron trifluoride. Data on the geometry and force field have also been correlated ). 

Boron trifluoride has a trigonal-planar structure. Formulate the bonding in terms of molecular orbitals for the Dsjj symmetry. In addition, construct wave functions for three equivalent sp2 hybrid orbitals, using the 2px, 2p, and 2s boron valence orbitals, which may be used to form three localized bonds with the three fluorines. Compare and contrast the molecular-orbital and the hybrid-orbital descriptions. 

In contrast to the low yield when hydrogen chloride is employed, an 88% yield of 2,4,6-triphenyl- 1,3,5-triazine (7) is obtained when chlorosulfonic acid is used as catalyst in a molecular ratio of 3 1 (CiSOjH/PhCN) at 0-5 C C and a reaction time of 12 to 24 hours.174 Trifluo-romethanesulfonic acid as a catalyst and solvent trimerizes benzonitrile at 91 °C in a yield of 66%.175 Lewis acids alone, such as aluminum, zinc, iron or titanium chlorides, phosphorus pentachloride, and boron trifluoride, have a considerably lower catalytic activity than the corresponding mixtures of Lewis acid with various promotors, such as mineral acids, organic acids and water. These differences are attributed to a change in the structure of the active complexes with the aryl cyanides. 

Although only cardol in CNSL has bifunctionality, attempts have been made to modify cardanol to the same effect. Thus reaction of (15 1)-cardanol with phenol in the presence of boron trifluoride afforded the 1,8-bis(hydroxyphenyl)pentadecane structure (ref. 261). Reaction then with a molar proportion of epichlorhydrin and polymerisation resulted in final products considered to be superior in properties to and cheaper than those derived from bisphenol A. The corresponding fully saturated cardbisphenol compound has been converted to a water soluble bis Mannich base by reaction with diethanolamine and formaldehyde (ref. 262) of value for cathodic electrodeposition. In another case of a related bis diethanolamine product, it was found necessary to react the hydroxyl groups with the monoisocyanate resulting from treatment of tolylenediisocyanate (TDI) with a molecular proportion of cardanol (ref. 263) in order to obtain a suitable binder for... 

Boron is a group IIIA element. Open the molecular model for boron trifluoride from the 3D Molecular Models section of the book s website. Near the boron atom, above and below the plane of the atoms in BF3, are two relatively large lobes. Considering the position of boron in the periodic table and the three-dimensional and electronic structure of BF3, what type of orbital does this lobe represent Is it a hybridized orbital or not ... 

The cationic polymerization of cyclopentadiene is catalyzed by tin-tetrachloride/ trichloroacetic acid/boron trifluoride [402-407]. The polymers that are partially insoluble in hydrocarbons feature 40 to 60% 1,2-structures next to trans-, 4 portions [Structures (60) and (61)]. With Ti(OC4H9)Cl3, soluble high-molecular-weight polycyclopentadiene is formed. Due to H-atoms in allyl and tertiary positions of the chain, the polymer is extremely sensitive to oxidation. This can be overcome by chlorination of the double bonds [408,409]. 

Figure 4.45 Lewis structure and molecular shape of boron trifluoride... 

The highest occupied molecular orbital (HOMO) of ammonia, where the nonbonding pair resides, is shown by red and blue lobes in its structure. When the reaction occurs, the electron density from the HOMO of ammonia is transferred to the LUMO of boron trifluoride. This interaction... 

Geller, S. and Hoard, J.L. (1950) Structures of molecular addition compounds. 1. Monomethyl amine-boron trifluoride, H3CH2N-BF3. Acta Crystallogr., 3, 121-129. 

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