ACYCLIC OR CARBOCYCLIC COMPOUNDS

**Definition:** This place covers:

Acyclic or carbocyclic (alicyclic) low molecular weight organic compounds

Processes for the preparation of acyclic or carbocyclic (alicyclic) low molecular weight organic compounds, whereby preparation also includes purification, separation, stabilisation or use of additives

The subclass C07C is divided into the following fields* (each field covering both compounds and processes):

*) In the absence of an indication to the contrary, a product or process is classified in the last appropriate place (last place rule)

**Limiting references (this place does not cover):** - Inorganic compounds -> C01 - Carbamic acid -> C01B21/12 - Carbon, inorganic compounds thereof, e.g. fullerenes -> C01B32/00 - Phosgene -> C01B32/80 - Carbides -> C01B32/90 - Hydrogen cyanide, cyanic and thiocyanic acid, isocyanic and isothiocyanic acid, cyanogen, cyanamide, and cyanogen halide -> C01C3/00 - Heterocyclic compounds -> C07D - Compounds containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen, sulfur, selenium and tellurium -> C07F - Compounds of unknown constitution -> C07G - Sugars -> C07H - Steroids -> C07J - Peptides -> C07K - Dyes and pigments -> C09B - Liquid crystal compounds -> C09K19/00 - Fermentative or enzymatic processes -> C12P - Production of organic compounds by electrolysis or electrophoresis -> C25B3/00 , C25B7/00

**Glossary:** - Acyclic: Not containing any rings - Carbocyclic: Containing a ring or ring system where all ring members are carbon atoms - Mineral acid: Inorganic acids such as HF, HCl, HBr, HI, HNO 3 , H 2 SO 3 , H 2 SO 4 , H 3 PO 3 , B(OH) 3 and H 2 CO 3 - Ester of a mineral acid: Ester of the above acids, including organic carbonates (e.g. ethylene carbonate) and R-Hal (e.g. CH 3 -Cl as ester of CH 3 -OH and HCl) - Non-metals: H, B, C, Si, N, P, O, S, Se, Te, noble gases, halogens - Metals: Elements other than non-metals - Platinum group: Os, Ir, Pt, Ru, Rh, Pd - Iron group: Fe, Co, Ni - Bridged (rings): Presence of at least one fusion other than ortho, peri or spiro, i.e. ring having more than two carbon atoms in common - Condensed ring system: Two rings are "condensed" if they share at least one ring member, i.e. "spiro" and "bridged" are considered as condensed. - "Number of rings" in a condensed ring system: Number of scissions necessary to convert the ring system into one acyclic chain - Organic compound: A compound satisfying one of the following criteria:- at least two carbon atoms bonded to each other, or- one carbon atom bonded to at least one hydrogen atom or halogen atom, or- one carbon atom bonded to at least one nitrogen atom by a single or double bond.Exceptions to the above criteria are: compounds consisting of only carbon atoms (e.g., fullerenes, etc.), cyanogen, cyanogen halides, cyanamide, metal carbides, phosgene, thiophosgene, hydrocyanic acid, isocyanic acid, isothiocyanic acid, fulminic acid, unsubstituted carbamic acid, and salts of the previously mentioned acids; these exceptions are considered to be inorganic compounds for classification purposes - Polycyclic: Containing two or more rings, condensed or isolated, e.g. a naphthyl ring or two isolated phenyl rings - Preparation: Covers synthesis, purification, separation, stabilisation or use of additives, unless a separate place is provided in the classification scheme - Quinones: Only compounds which can be considered oxidation products of aromatic compounds (hydroquinones) are encompassed (acenaphthenequinone