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by AUSTIN M. PATTERSON

Organic Boron Compounds A group of the Committee on

Nomenclature of the ACS Division of Organic Chemistry has drawn up a tentative report on this topic, of which we give here a preview. Heading the group is Kurt F . Loen-ing of the Chemical Abstracts staff, to whom comments should be ad­dressed.

The names of some of the boron hydrides are: BH3 , borane ( 3 ) , or simply borane; B2H4 , diborane(4) ; B2H6 , d iborane(6) ; B4H4 , tetra-borane(4) ; B4H1 0 , tetraborane(lO); B5H9 , pentaborane(9) ; BeHu, pentaborane ( 11 ) ; and so on; cf. Wartik and Schaeffer, C&EN 32, 1441-2 ( 1954 ) . Derivatives of the boranes are denoted by prefixes; as, IBC12, dichloroiodoborane; CH3-BH.H2 .BH2 , l -methyldiborane(6) . Bridging positions are indicated by μ ; as, μ,-aminodiborane ( 6 ) . The radical H 2B- is called boryl; the names of higher radicals end in "-boranyl"; as, H 2 B(H 2 )BH- , 1-diboran(6)yl .

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salts) are formed by naming the base or donor molecule first, and joining this to the name of the acid or acceptor molecule by a hyphen; as, (CH 3 ) 3 N:BH 3 , trimethylamine-borane; OC:BH3 , carbon monoxide-( C-B ) borane; CH 3 ONH 2 : BH3 : methoxy amine ( N-B ) borane.

Ring Systems. Four-, five-, and six-membered rings, especially in the lower stages of hydrogénation. are given "Widmann"-type names.

ι as in the "Ring Index"; as, NH.B:-NL CH:CH, 1,3,2-diazaborole;

O.BH.O.CH2 .CH2 , 1,3,2-dioxaboro-lane. For larger rings the "a" no-

i menclature is used; as BH.CH2 .-

1

CH2 .CH2 .Bri .CH2 .Cri2 .CH2 , 1,5-diboracyclo-octane. Trivial names are used only if the ring has partic­ular stability; as, NH.BH.NH.BH.-

1 2 3 4 NH.BH, borazine.

5 6

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Coordination Compounds • of Boron. The generally accepted rules are applied; as, N a ( H O ) 2 -BF2 , sodium dihydroxodifluoro-bora te( I I I ) . (The "111" may be omitted when the oxidation state of 3 is clear.) The name "borohy-dride" may be retained for the un-substituted BH4~ group. However, it may be more convenient to re­gard the BH4~ group or its sub­stituted derivative a s attached to another element as the center of coo lination; as, A1(BH4)3 , tris-( tetrahydridobo r a t ο ) -a 1 u m i η u m-( I I I ) .

Boron oxides are named as bi­nary compounds, using Greek numerical prefixes; as, B 4 0 5 , tetra-boron pentoxide. The customary name "boric oxide" may be re­tained for B 2 0 3 .

For the following boron acids these customary names may b e re­tained: H 3 B0 2 , borous acid; H 4 B 2 0 4 , hypoboric acid; H 3 B 0 3 , orthoboric acid; HB02> metaboric acid. Boron acids and their salts are in general named with numer­als indicating the atomic ratios; as. HB 5 0 8 , boric (1.5.8) acid; Na2-B 40 7 , sodium borate (2.4.7 ) ; NaHB 4 0 7 , sodium hydrogen bo­rate (2.4.7). Complex boron acids and their salts are named as co­ordination compounds; as HBF 4 , tetrafluoroboric acid.

Organic boron acids are named as oxy and hydroxy derivatives of borane; as, C 6 H 5 B(OH) 2 , dihy-droxyphenylborane. Their salts are named as coordination com­pounds; as, C 6 H 5 B ( 0 r I ) O , silver oxohydroxophenylborate ( III ) .

Stoichiometric mames may be used where naming by the above rules is not practicable; as B10C19 , decaboron enneachloride.

Naming by the oxa-thia-aza system is recommended in cases where the foregoing rules do not work out conveniently. A com­mittee is now studying this system.

In the report the rules are accom­panied by numerous tables of ex­amples.

5 6 0 C&EN FEB. 6. 1956

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