OrganicChemistry|Studio

Draw and analyze.
Molecular modeling for organic chemistry.

Draw any structure and the studio builds it in 3D to standard values (C–C 1.54 Å, 109.47° at sp3 carbon, C=C 1.34 Å at 120°), checks every bond and angle on screen, and shows you the chemistry the drawing implies. OrganicChemistry Studio helps you visualize organic molecules by drawing.

Draw your own →See the modules →
Geometry verified  the badge on every 3-D model

Draw Your Own

✎IUPAC Naming: Draw It, See It, Name ItSketch a molecule; the name is built rule by rule. Then hide it and test yourself. ✎Draw It Yourself: 3D Model and Newman ProjectionSketch an alkane, alkene or ring; see it in 3D, look down any bond, turn it through 360°. ✎Functional Groups: Draw It, Name the GroupsSketch any structure; every functional group is named and lit up in 2D and 3D. ✎Aromatic, Antiaromatic, or Non-aromaticnewDraw a ring; the four tests run in order and stop at the first that fails. ✎Chiral, Achiral, or Meso: Draw Your OwnDraw it, set the stereocenters, get the verdict with CIP priorities and R/S.

Where the numbers come from

A standard geometry is a frame of reference, not a description of any real molecule. Every model here is constructed from one table of values: C–C 1.54 Å, C=C 1.34 Å, C≡C 1.20 Å, C–H 1.09 Å; 109.47° at sp3 carbon, 120° at sp2, 180° at sp; dihedral angles of exactly ±60° or 180° about single bonds. Where a module departs from these values on purpose (an eclipsed rotamer, a three- or four-membered ring, a boat), the badge records the departure. Real molecules differ, and the differences are known: the C–C–C angle in cyclohexane is about 111°, cyclobutane is puckered rather than planar, and the gauche dihedral in butane is closer to 65° than to 60°. The standard geometry is used because it is the reference frame in which introductory organic chemistry counts gauche and syn-pentane interactions, assigns axial and equatorial positions, and assigns R and S.

How to use a module

Rotate and zoomDrag to rotate; scroll or pinch to zoom . Works with a mouse, trackpad, or fingers on a tablet.
MeasureClick 2 atoms for a distance, 3 for an angle, 4 for a dihedral. Every number is read from the coordinates on screen.
Read the badge● Green: every value standard.
● Amber: something deliberately departs from the standard values.

Conformational analysis

Pentane: 2D and 3DSkeletal and Lewis drawings beside the ideal 3D model. Butane Rotation ProfileTurn the C2–C3 bond through 360° with a live Newman projection. Pentane ConformersAnti, gauche and the syn-pentane clash. Cyclohexane Ring FlipChair, twist-boat, boat and the animated flip. Dimethylcyclohexane ChairsAll seven isomers, both chairs, strain totalled. Alkylcyclohexane ChairsMethyl to tert-butyl: why the A-value jumps. Fused Rings on the Diamond LatticeDecalins, adamantane and the steroid core. Ring StrainCyclopropane to cyclohexane: angle strain, eclipsing, energies.