What does spiro mean in chemistry?
Spiro: A molecule containing two or more rings in which the adjoined rings share exactly one atom.
What is spiro ketone?
The heterocyclic spiro product, at right of arrow, is a common ketal (acetal) structure prepared from a monocyclic type of ketone and a generally acyclic type of diol (both at left of arrow). The schematic is for the synthesis of the protected 1,4-dioxaspiro[4.5]decane from cyclohexanone and the alcohol, ethanediol.
How do you write spiro compounds?
The format of writing of IUPAC nomenclature for non sub- stituted spiro compounds is ‘spiro[a,b]alkane’ and for substituted spiro compounds are ‘x-substituent name spiro[a,b]alkane’ (in presence of only one substituent); ‘x- substituent name spiro[a,b]alkene/alk-y-ene’ (in presence of one double bond and one …
Are spiro compounds planar?
Unlike trans-cyclooctene or a biphenyl, this molecule cannot be made to lie in a plane by torsional motion (at least not as long as we maintain the tetrahedral nature about the spiro carbon). Therefore, this molecule does not possess a chirality plane. Rather, this molecule is analogous to the allenes.
Can bicyclic rings flip?
Bicyclic Ring Systems A bond or a chain of bonds connecting the bridgehead carbon atoms is called a bridge. Decalins can come in two diastereomers, the trans– or cis– diastereomer. The trans-diastereomer is a rigid structure which cannot undergo a ring flip.
What are ANSA compounds?
An ansa-metallocene is a type of organometallic compound containing two cyclopentadienyl ligands that are linked by a bridging group such that both cyclopentadienyl groups are bound to the same metal.
What is bicyclic system?
A bicyclic molecule (bi = two, cycle = ring) is a molecule that features two joined rings. Bicyclic structures occur widely, for example in many biologically important molecules like α-thujene and camphor.
What are two fused benzene rings called?
Polycyclic Aromatic Hydrocarbons Naphthalene consists of two benzene rings that are fused together; the resulting molecule is still aromatic, and undergoes the reactions that are typical of benzene itself.
Is Half chair chiral?
A normal half-chair will have an axis of symmetry and is chiral.
What is ANSA biochemistry?
Synonyms. ANSA (ammonium) 206659-00-9. Ammonium 1-anilinonaphthalene-8-sulfonate.
What is the full form of ANSA?
ANSA was initially standing for ‘Automatic net generation for structural analysis’, but the software has gone beyond that very quickly.
Why Pentalene is non-aromatic?
Pentalene is a polycyclic hydrocarbon composed of two fused cyclopentadiene rings. It has chemical formula C 8H 6. It is antiaromatic, because it has 4n π electrons where n is any integer. For this reason it dimerizes even at temperatures as low as −100 °C.