Butyne, formulas

Chemical Designations-SynotQ mr 2-Butyne-l,4-Diol l,4-Dihydroxy-2-Butyne Chemical Formula HOCHjCbCCHjOH. 

The model shows the structural formula of 1-butyne. Which of these is the proper condensed structural formula for 1-butyne ... 

Complex condensation products are obtained by reaction of the alkyne complex with excess of 3,3-dimethyl-l-butyne, which yields two isomeric products of formulas Ru3(CO)6[HC2C(Me)3-COCH2CMe3][HC2CMe3]2 (125). The X-ray structure of one of those adducts (Fig. 19) shows that both dimerization of two alkyne molecules and the insertion of carbon monoxide into the alkyne metal bonds have occurred. The Ru-Ru distances of 2.820,2.828, and 2.686 A in the ring are of interest. The value of 2.686 A is one of the shortest found in a... 

Write a condensed formula for (a) butane, (b) 2-butene, (c) 1-butyne, (d) 1-butanol, (e) butanal, (f) butanone, (g) butanoic acid, (h) butanamide. 

Some nickel derivatives with a formula Ni(PR3) 2 (alkyne) have been reported 200) (alkyne = tolane and butyne R = Et) but not described in detail. 

Hydrocarbons that contain one triple bond are called alkynes, and they are given the suffix -yne. The number of carbon atoms that an alkyne contains is indicated by its prefix, and the number of hydrogen atoms can be determined from the formula CH, where n is the number of carbon atoms. For example, butyne contains four carbon atoms, as indicated by the prefix but- and six hydrogen atoms (2 x 4 - 2 = 6). 

Draw a Lewis formula and a three-dimensional structure for each of the following polycentered molecules. Indicate hybridizations and bond angles at each carbon atom, (a) butane, C4H3Q (b) propene, H2C=CHCH3 (c) 1-butyne, HC=CCH2CH3 (d) acetaldehyde, CH3CHO. 

Write the structural formulas of the following compounds (a) 1-butyne (b) 2-methylpropene (c) 2-ethyl-3-methyl-l-butene (d) 3-methyl-1-butyne. 

There are other alkyne compounds, but they do not have much commercial value, and will not be commonly encountered. A three-carbon compound with one triple bond has prop as a prefix for three carbons and is called propyne, with a molecular formula of C3H4 It is listed in the Condensed Chemical Dictionary as propyne, but you are referred to methylacetylene for information. It is listed as a dangerous fire risk, and it is toxic by inhalation. Propyne is used as a specialty fuel and as a chemical intermediate. A four-carbon alkyne has the prefix but, and the compound is called butyne, with the molecular formula of C4H6. The chemical listing is under the name ethylacetylene, and it is designated as a dangerous fire risk. It is also used as a specialty fuel and as a chemical intermediate. The following shows the structures for ethyne, propyne, and butyne ... 

Write structural formulas for the following compounds (a) traw5 -2-pentene, (b) 2-ethyl-l-butene, (c) 4-ethyl-fra i -2-heptene, (d) 3-phenyl-butyne. 

Give the molecular formula for each of the following compounds 2-butyne, propyne, 2-butene. 

Study the structures of ethyne, propyne, butyne, and other alkynes, and show that their formulas fit the general formula for alkynes, CnH2n 2-... 

Hock and Mills, in 1958, established that the best representation of the complex obtained from 2-butyne was as shown in formula (CIV) (6, 118). One iron atom and two of its three carbonyl ligands are very nearly coplanar with the four-carbon chain and its two methyl substituents. The other iron atom is approximately equidistant from the four ring carbon atoms and is apparently analogous to that in the butadiene-Fe(CO)3 complexes. An Fe—Fe bond, which would preserve the inert gas structure of the ring Fe atom, is assumed, the distance being 2.49 A. The molecular orbital structure of this system has been discussed 119). 

Synonyms Bis (hydroxymethyl) acetylene 2-Butin-1,4-diol Butynediol 1,4-Butynediol 2-Butynediol 2-Butyne-1,4-diol 1,4-Dihydroxy-2-butyne Empirical C4Hg02 Formula H0CH2=CCH20H... 

---