Group recommended name

We use the recommended notation of the AIChE for dimensionless groups that are named after their originator, i.e., a capital N with a subscript identifying the person the group is named for. However, a number of dimensionless quantities that are identified by other symbols see, for example, Section IV. 

Since thujane contains as ring substituents an isopropyl group as well as a methyl group, the name "northujane (see Appendix D) does not conform to the terpene traditional definition of nor. The bicyclo plan name, that is bicyclo[23.1.0 ]hexane, is therefore recommended for the name of the parent ring structure of thujane, the fourth fundamental type of bicyclic terpenes. 

Rule 9. Indicate the position of each double bond within the ring structure by only the number of the lower-numbered carbon to which the double bond is attached — e.g, bicycloQ3.1.0 ]hex-2-ene, 2,4-norcaradiene, 3-norpinene. If double bonds attach substituents to the rings or are present in the substituent groups, their presence is denoted in the names of the substituent groups — e.g., the systematic name for sabinene (Formula 49, Chart 10) is l-isopropyl-4-methylenebicycloQ3.1.0 hexane the nor- name, which is the recommended name, for nopadiene (Formula 64, Chart 12) i s 6,6-dimethyl- 2-vinyl- 2-norpinene. 

These and other considerations led directly to the recommended name bomane group for the group of bicyclic terpene hydrocarbons currently called the camphane group. Specific recommendations on continued usage of the common terpene names of bornane-type bicyclics are being withheld until a more thorough study has been made of the nomenclature of their derivatives. 

Structures and the recommended names of compounds belonging to the bomane group of bicyclic terpene hydrocarbons are given in Chart 14. Reasons for coining the name bornane and for the necessity of using the norbomane-type names to systematize the nomenclature of the bicyclo 2.2. [] heptane bicyclics have been presented earlier. Examination of the names in Chart 14 reveals that in the systematic bicyclo 2.2.1 ]heptane names and the recommended norbornane names the prefix numbers for substituents and double bonds and the order of names of substituents are identical. 

Dehydrogenases (or oxidoreductases) constitute the first of six main divisions in the Enzyme Commission classification [ 1 ]. About 300 dehydrogenases that utilize nicotinamide coenzymes are known, and this chapter deals with some of them. The recommended name and EC number designate not a single enzyme protein, but a group of proteins with the same catalytic property [1]. 

The polymer produced in eq 1.1 is known as polyethylene and, less commonly, as polymethylene, polyethene or polythene. (In the late 1960s, "polythene" became part of popular culture when the Beatles released "Polythene Pam.") Polyethylene is the lUPAC recommended name for homopolymer. As we shall see, however, many important ethylene-containing polymers are copolymers. Nomenclatures for various types of polyethylene are addressed in section 1.3. Though some have suggested that its name implies the presence of unsaturated carbon atoms, there are in fact few C=C bonds in polyethylene, usually less than 2 per thousand carbon atoms and these occur primarily as vinyl or vinylidene end groups. 

The nomenclature is illustrated by Table 1, which gives the names of the major types of organosulfur compounds. The original name mercaptan for thiols is no longer recommended, except that the term mercapto is retained for the unsubstituted SH group. In the table, an asterisk indicates the International Union of Pure and Applied Chemistry (IUPAC) recommended name. 

Table 1.4 lUPAC recommended names for groups of elements in the periodic table. 

Chromium [CAS Registry Number 7440-47-3] is a steel-gray, lustrous metal that takes a high polish pure chromium and its alloys are quite resistant to corrosion. Chromium belongs to the 6th Group (formerly named VIB) of the Periodic Table of Elements due to the lUPAC recommendations. The specific density of chromium is... 

Because the U.S. groups were not given an opportunity to view and comment on the accuracy of any draft reports from the TWG after their visit to Berkeley in 1998 and their subsequent visit to Dubna in 1999, they were totally taken aback by this rapid publication of the TWG conclusions without the iterative process that they had understood would take place with the involved groups at LBL in the United States, GSI in Darmstadt, Germany, and JINR in Dubna, USSR. In an attempt to counteract this criticism, responses from the Berkeley, Dubna, and GSI groups were invited and published in the IUPAC journal immediately following the TWG Discovery article of 1993 (Barber et al., 1993). The IUPAC then stated that this TWG report could now be considered by the CNIC, which had the responsibility for recommending names. However, it was pointed out that the TWG report had not been subjected to the external and internal review required by the IUPAC prior to publication. 

This group, subsequently named the GIF Policy Group, also decided to form a group of senior technical experts to explore areas of mutual interest and make recommendations regarding both research and development (R D) areas and processes by which collaboration could be conducted and assessed. This senior Technical Experts Group first met in April 2000. 

Although the lUPAC has recommended the names tetrahydroborate, tetrahydroaluminate, etc, this nomenclature is not yet ia general use. Borohydrides. The alkaU metal borohydrides are the most important complex hydrides. They are ionic, white, crystalline, high melting soHds that are sensitive to moisture but not to oxygen. Group 13 (IIIA) and transition-metal borohydrides, on the other hand, are covalendy bonded and are either Hquids or sublimable soHds. The alkaline-earth borohydrides are iatermediate between these two extremes, and display some covalent character. 

Negatively coordinated groups are given before neutral coordinated groups in the examples of Werner scheme names above. Ewens and Bassett presented good reasons why that order should be reversed. The lUPAC rules (20) recommend that ligands be cited in alphabetical order regardless of their... 

---